diff --git a/sdrbase/audio/audiodeviceinfo.cpp b/sdrbase/audio/audiodeviceinfo.cpp
new file mode 100644
index 000000000..a5f68e2e0
--- /dev/null
+++ b/sdrbase/audio/audiodeviceinfo.cpp
@@ -0,0 +1,132 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2022 Jon Beniston, M7RCE                                        //
+//                                                                               //
+// This program is free software; you can redistribute it and/or modify          //
+// it under the terms of the GNU General Public License as published by          //
+// the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
+//                                                                               //
+// This program is distributed in the hope that it will be useful,               //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#include "audiodeviceinfo.h"
+
+QString AudioDeviceInfo::deviceName() const
+{
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    return m_deviceInfo.description();
+#else
+    return m_deviceInfo.deviceName();
+#endif
+}
+
+bool AudioDeviceInfo::isFormatSupported(const QAudioFormat &settings) const
+{
+    return m_deviceInfo.isFormatSupported(settings);
+}
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+QList<int> AudioDeviceInfo::supportedSampleRates() const
+{
+    // QAudioDevice is a bit more flexible than QAudioDeviceInfo, in that it supports
+    // min and max rate, rather than a specific list
+    // For now, we just list some common rates.
+    QList<int> sampleRates = {8000, 11025, 22050, 44100, 48000, 96000, 192000};
+    QList<int> supportedRates;
+    for (auto sampleRate : sampleRates)
+    {
+        if ((sampleRate <= m_deviceInfo.maximumSampleRate()) && (sampleRate >= m_deviceInfo.minimumSampleRate())) {
+            supportedRates.append(sampleRate);
+        }
+    }
+    return supportedRates;
+}
+#else
+QList<int> AudioDeviceInfo::supportedSampleRates() const
+{
+    return m_deviceInfo.supportedSampleRates();
+}
+#endif
+
+QString AudioDeviceInfo::realm() const
+{
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    return ""; // Don't appear to have realms in Qt6
+#else
+    return m_deviceInfo.realm();
+#endif
+}
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+QList<AudioDeviceInfo> AudioDeviceInfo::availableInputDevices()
+{
+    QList<QAudioDevice> devInfos = QMediaDevices::audioInputs();
+    QList<AudioDeviceInfo> list;
+
+    for (auto devInfo : devInfos) {
+        list.append(AudioDeviceInfo(devInfo));
+    }
+
+    return list;
+}
+
+QList<AudioDeviceInfo> AudioDeviceInfo::availableOutputDevices()
+{
+    QList<QAudioDevice> devInfos = QMediaDevices::audioOutputs();
+    QList<AudioDeviceInfo> list;
+
+    for (auto devInfo : devInfos) {
+        list.append(AudioDeviceInfo(devInfo));
+    }
+
+    return list;
+}
+#else
+QList<AudioDeviceInfo> AudioDeviceInfo::availableInputDevices()
+{
+    QList<QAudioDeviceInfo> devInfos = QAudioDeviceInfo::availableDevices(QAudio::AudioInput);
+    QList<AudioDeviceInfo> list;
+
+    for (auto devInfo : devInfos) {
+        list.append(AudioDeviceInfo(devInfo));
+    }
+
+    return list;
+}
+
+QList<AudioDeviceInfo> AudioDeviceInfo::availableOutputDevices()
+{
+    QList<QAudioDeviceInfo> devInfos = QAudioDeviceInfo::availableDevices(QAudio::AudioOutput);
+    QList<AudioDeviceInfo> list;
+
+    for (auto devInfo : devInfos) {
+        list.append(AudioDeviceInfo(devInfo));
+    }
+
+    return list;
+}
+#endif
+
+AudioDeviceInfo AudioDeviceInfo::defaultOutputDevice()
+{
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    return AudioDeviceInfo(QMediaDevices::defaultAudioOutput());
+#else
+    return AudioDeviceInfo(QAudioDeviceInfo::defaultOutputDevice());
+#endif
+}
+
+AudioDeviceInfo AudioDeviceInfo::defaultInputDevice()
+{
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    return AudioDeviceInfo(QMediaDevices::defaultAudioInput());
+#else
+    return AudioDeviceInfo(QAudioDeviceInfo::defaultInputDevice());
+#endif
+}
diff --git a/sdrbase/audio/audiodeviceinfo.h b/sdrbase/audio/audiodeviceinfo.h
new file mode 100644
index 000000000..b5df24ec1
--- /dev/null
+++ b/sdrbase/audio/audiodeviceinfo.h
@@ -0,0 +1,82 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2022 Jon Beniston, M7RCE                                        //
+//                                                                               //
+// This program is free software; you can redistribute it and/or modify          //
+// it under the terms of the GNU General Public License as published by          //
+// the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
+//                                                                               //
+// This program is distributed in the hope that it will be useful,               //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDE_AUDIODEVICEINFO_H
+#define INCLUDE_AUDIODEVICEINFO_H
+
+#include <QAudioFormat>
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#include <QMediaDevices>
+#include <QAudioDevice>
+#else
+#include <QAudioDeviceInfo>
+#endif
+
+#include "export.h"
+
+// Wrapper around QT6's QAudioDevice and and QT5's QAudioDeviceInfo
+class SDRBASE_API AudioDeviceInfo {
+
+public:
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    AudioDeviceInfo() :
+        m_deviceInfo()
+    {
+    }
+
+    AudioDeviceInfo(QAudioDevice deviceInfo) :
+        m_deviceInfo(deviceInfo)
+    {
+    }
+
+    QAudioDevice deviceInfo() { return m_deviceInfo; }
+#else
+    AudioDeviceInfo() :
+        m_deviceInfo()
+    {
+    }
+
+    AudioDeviceInfo(QAudioDeviceInfo deviceInfo) :
+        m_deviceInfo(deviceInfo)
+    {
+    }
+
+    QAudioDeviceInfo deviceInfo() { return m_deviceInfo; }
+#endif
+
+    QString deviceName() const;
+    QString realm() const;
+    bool isFormatSupported(const QAudioFormat &settings) const;
+    QList<int> supportedSampleRates() const;
+
+    static QList<AudioDeviceInfo> availableInputDevices();
+    static QList<AudioDeviceInfo> availableOutputDevices();
+    static AudioDeviceInfo defaultInputDevice();
+    static AudioDeviceInfo defaultOutputDevice();
+
+private:
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    QAudioDevice m_deviceInfo;
+#else
+    QAudioDeviceInfo m_deviceInfo;
+#endif
+
+};
+
+#endif // INCLUDE_AUDIODEVICEINFO_H
diff --git a/sdrbase/audio/audiodevicemanager.cpp b/sdrbase/audio/audiodevicemanager.cpp
index d8101274c..382b756ec 100644
--- a/sdrbase/audio/audiodevicemanager.cpp
+++ b/sdrbase/audio/audiodevicemanager.cpp
@@ -79,14 +79,15 @@ QDataStream& operator>>(QDataStream& ds, AudioDeviceManager::OutputDeviceInfo& i
 AudioDeviceManager::AudioDeviceManager()
 {
     qDebug("AudioDeviceManager::AudioDeviceManager: scan input devices");
-    m_inputDevicesInfo = QAudioDeviceInfo::availableDevices(QAudio::AudioInput);
+    m_inputDevicesInfo = AudioDeviceInfo::availableInputDevices();
 
     for (int i = 0; i < m_inputDevicesInfo.size(); i++) {
         qDebug("AudioDeviceManager::AudioDeviceManager: input device #%d: %s", i, qPrintable(m_inputDevicesInfo[i].deviceName()));
     }
 
     qDebug("AudioDeviceManager::AudioDeviceManager: scan output devices");
-    m_outputDevicesInfo = QAudioDeviceInfo::availableDevices(QAudio::AudioOutput);
+
+    m_outputDevicesInfo = AudioDeviceInfo::availableOutputDevices();
 
     for (int i = 0; i < m_outputDevicesInfo.size(); i++) {
         qDebug("AudioDeviceManager::AudioDeviceManager: output device #%d: %s", i, qPrintable(m_outputDevicesInfo[i].deviceName()));
@@ -737,7 +738,7 @@ void AudioDeviceManager::inputInfosCleanup()
 {
     QSet<QString> deviceNames;
     deviceNames.insert(m_defaultDeviceName);
-    QList<QAudioDeviceInfo>::const_iterator itd = m_inputDevicesInfo.begin();
+    QList<AudioDeviceInfo>::const_iterator itd = m_inputDevicesInfo.begin();
 
     for (; itd != m_inputDevicesInfo.end(); ++itd)
     {
@@ -765,7 +766,7 @@ void AudioDeviceManager::outputInfosCleanup()
 {
     QSet<QString> deviceNames;
     deviceNames.insert(m_defaultDeviceName);
-    QList<QAudioDeviceInfo>::const_iterator itd = m_outputDevicesInfo.begin();
+    QList<AudioDeviceInfo>::const_iterator itd = m_outputDevicesInfo.begin();
 
     for (; itd != m_outputDevicesInfo.end(); ++itd)
     {
diff --git a/sdrbase/audio/audiodevicemanager.h b/sdrbase/audio/audiodevicemanager.h
index 2966d6f41..6f260deee 100644
--- a/sdrbase/audio/audiodevicemanager.h
+++ b/sdrbase/audio/audiodevicemanager.h
@@ -22,10 +22,10 @@
 #include <QStringList>
 #include <QList>
 #include <QMap>
-#include <QAudioDeviceInfo>
 
 #include "audio/audioinputdevice.h"
 #include "audio/audiooutputdevice.h"
+#include "audio/audiodeviceinfo.h"
 #include "export.h"
 
 class QDataStream;
@@ -97,8 +97,8 @@ public:
 	AudioDeviceManager();
 	~AudioDeviceManager();
 
-	const QList<QAudioDeviceInfo>& getInputDevices() const { return m_inputDevicesInfo; }
-    const QList<QAudioDeviceInfo>& getOutputDevices() const { return m_outputDevicesInfo; }
+    const QList<AudioDeviceInfo>& getInputDevices() const { return m_inputDevicesInfo; }
+    const QList<AudioDeviceInfo>& getOutputDevices() const { return m_outputDevicesInfo; }
 
     bool getOutputDeviceName(int outputDeviceIndex, QString &deviceName) const;
     bool getInputDeviceName(int inputDeviceIndex, QString &deviceName) const;
@@ -129,8 +129,8 @@ public:
     static const QString m_defaultDeviceName;
 
 private:
-    QList<QAudioDeviceInfo> m_inputDevicesInfo;
-    QList<QAudioDeviceInfo> m_outputDevicesInfo;
+    QList<AudioDeviceInfo> m_inputDevicesInfo;
+    QList<AudioDeviceInfo> m_outputDevicesInfo;
 
     QMap<AudioFifo*, int> m_audioSinkFifos; //< audio sink FIFO to audio output device index-1 map
     QMap<AudioFifo*, MessageQueue*> m_audioFifoToSinkMessageQueues; //!< audio sink FIFO to attached sink message queue
diff --git a/sdrbase/audio/audioinputdevice.cpp b/sdrbase/audio/audioinputdevice.cpp
index 2fcc91e10..a1ccb0d70 100644
--- a/sdrbase/audio/audioinputdevice.cpp
+++ b/sdrbase/audio/audioinputdevice.cpp
@@ -16,10 +16,15 @@
 ///////////////////////////////////////////////////////////////////////////////////
 
 #include <string.h>
+#include <QDebug>
 #include <QAudioFormat>
-#include <QAudioDeviceInfo>
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#include <QAudioSource>
+#else
 #include <QAudioInput>
+#endif
 #include "audio/audioinputdevice.h"
+#include "audio/audiodeviceinfo.h"
 #include "audio/audiofifo.h"
 
 AudioInputDevice::AudioInputDevice() :
@@ -50,16 +55,16 @@ bool AudioInputDevice::start(int device, int rate)
 	if (m_audioUsageCount == 0)
 	{
         QMutexLocker mutexLocker(&m_mutex);
-        QAudioDeviceInfo devInfo;
+        AudioDeviceInfo devInfo;
 
         if (device < 0)
         {
-            devInfo = QAudioDeviceInfo::defaultInputDevice();
+            devInfo = AudioDeviceInfo::defaultInputDevice();
             qWarning("AudioInputDevice::start: using default device %s", qPrintable(devInfo.defaultInputDevice().deviceName()));
         }
         else
         {
-            QList<QAudioDeviceInfo> devicesInfo = QAudioDeviceInfo::availableDevices(QAudio::AudioInput);
+            QList<AudioDeviceInfo> devicesInfo = AudioDeviceInfo::availableInputDevices();
 
             if (device < devicesInfo.size())
             {
@@ -68,7 +73,7 @@ bool AudioInputDevice::start(int device, int rate)
             }
             else
             {
-                devInfo = QAudioDeviceInfo::defaultInputDevice();
+                devInfo = AudioDeviceInfo::defaultInputDevice();
                 qWarning("AudioInputDevice::start: audio device #%d does not exist. Using default device %s", device, qPrintable(devInfo.deviceName()));
             }
         }
@@ -77,29 +82,49 @@ bool AudioInputDevice::start(int device, int rate)
 
         m_audioFormat.setSampleRate(rate);
         m_audioFormat.setChannelCount(2);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        m_audioFormat.setSampleFormat(QAudioFormat::Int16);
+#else
         m_audioFormat.setSampleSize(16);
         m_audioFormat.setCodec("audio/pcm");
         m_audioFormat.setByteOrder(QAudioFormat::LittleEndian);
         m_audioFormat.setSampleType(QAudioFormat::SignedInt); // Unknown, SignedInt, UnSignedInt, Float
+#endif
 
         if (!devInfo.isFormatSupported(m_audioFormat))
         {
-            m_audioFormat = devInfo.nearestFormat(m_audioFormat);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+            qWarning("AudioInputDevice::start: %d Hz S16_LE audio format not supported.");
+#else
+            m_audioFormat = devInfo.deviceInfo().nearestFormat(m_audioFormat);
             qWarning("AudioInputDevice::start: %d Hz S16_LE audio format not supported. Nearest is sampleRate: %d channelCount: %d sampleSize: %d sampleType: %d",
                     rate, m_audioFormat.sampleRate(), m_audioFormat.channelCount(), m_audioFormat.sampleSize(), (int) m_audioFormat.sampleType());
+#endif
         }
         else
         {
             qInfo("AudioInputDevice::start: audio format OK");
         }
 
-        if (m_audioFormat.sampleSize() != 16)
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        if (m_audioFormat.sampleFormat() != QAudioFormat::Int16)
         {
-            qWarning("AudioInputDevice::start: Audio device '%s' failed", qPrintable(devInfo.defaultInputDevice().deviceName()));
+            qWarning("AudioInputDevice::start: Audio device '%s' failed", qPrintable(devInfo.deviceName()));
             return false;
         }
+#else
+        if (m_audioFormat.sampleSize() != 16)
+        {
+            qWarning("AudioInputDevice::start: Audio device '%s' failed", qPrintable(devInfo.deviceName()));
+            return false;
+        }
+#endif
 
-        m_audioInput = new QAudioInput(devInfo, m_audioFormat);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        m_audioInput = new QAudioSource(devInfo.deviceInfo(), m_audioFormat);
+#else
+        m_audioInput = new QAudioInput(devInfo.deviceInfo(), m_audioFormat);
+#endif
         m_audioInput->setVolume(m_volume);
 
         QIODevice::open(QIODevice::ReadWrite);
@@ -167,6 +192,8 @@ qint64 AudioInputDevice::writeData(const char *data, qint64 len)
 //    QMutexLocker mutexLocker(&m_mutex);
 //#endif
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#else
     if ((m_audioFormat.sampleSize() != 16)
     		|| (m_audioFormat.sampleType() != QAudioFormat::SignedInt)
 			|| (m_audioFormat.byteOrder() != QAudioFormat::LittleEndian))
@@ -174,6 +201,7 @@ qint64 AudioInputDevice::writeData(const char *data, qint64 len)
     	qCritical("AudioInputDevice::writeData: invalid format not S16LE");
     	return 0;
     }
+#endif
 
     if (m_audioFormat.channelCount() != 2) {
     	qCritical("AudioInputDevice::writeData: invalid format not stereo");
diff --git a/sdrbase/audio/audioinputdevice.h b/sdrbase/audio/audioinputdevice.h
index 0973ac51b..8f3214a39 100644
--- a/sdrbase/audio/audioinputdevice.h
+++ b/sdrbase/audio/audioinputdevice.h
@@ -25,7 +25,11 @@
 #include <vector>
 #include "export.h"
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+class QAudioSource;
+#else
 class QAudioInput;
+#endif
 class AudioFifo;
 class AudioOutputPipe;
 
@@ -48,7 +52,11 @@ public:
 
 private:
 	QRecursiveMutex m_mutex;
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	QAudioSource* m_audioInput;
+#else
 	QAudioInput* m_audioInput;
+#endif
 	uint m_audioUsageCount;
 	bool m_onExit;
 	float m_volume;
diff --git a/sdrbase/audio/audiooutputdevice.cpp b/sdrbase/audio/audiooutputdevice.cpp
index 4c445e6eb..32d32c840 100644
--- a/sdrbase/audio/audiooutputdevice.cpp
+++ b/sdrbase/audio/audiooutputdevice.cpp
@@ -18,9 +18,13 @@
 
 #include <string.h>
 #include <QAudioFormat>
-#include <QAudioDeviceInfo>
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#include <QAudioSink>
+#else
 #include <QAudioOutput>
+#endif
 #include "audiooutputdevice.h"
+#include "audiodeviceinfo.h"
 #include "audiofifo.h"
 #include "audionetsink.h"
 #include "dsp/wavfilerecord.h"
@@ -59,20 +63,19 @@ AudioOutputDevice::~AudioOutputDevice()
 
 bool AudioOutputDevice::start(int device, int rate)
 {
-
 //	if (m_audioUsageCount == 0)
 //	{
         QMutexLocker mutexLocker(&m_mutex);
-        QAudioDeviceInfo devInfo;
+        AudioDeviceInfo devInfo;
 
         if (device < 0)
         {
-            devInfo = QAudioDeviceInfo::defaultOutputDevice();
+            devInfo = AudioDeviceInfo::defaultOutputDevice();
             qWarning("AudioOutputDevice::start: using system default device %s", qPrintable(devInfo.defaultOutputDevice().deviceName()));
         }
         else
         {
-            QList<QAudioDeviceInfo> devicesInfo = QAudioDeviceInfo::availableDevices(QAudio::AudioOutput);
+            QList<AudioDeviceInfo> devicesInfo = AudioDeviceInfo::availableOutputDevices();
 
             if (device < devicesInfo.size())
             {
@@ -81,23 +84,34 @@ bool AudioOutputDevice::start(int device, int rate)
             }
             else
             {
-                devInfo = QAudioDeviceInfo::defaultOutputDevice();
+                devInfo = AudioDeviceInfo::defaultOutputDevice();
                 qWarning("AudioOutputDevice::start: audio device #%d does not exist. Using system default device %s", device, qPrintable(devInfo.defaultOutputDevice().deviceName()));
             }
         }
 
         //QAudioDeviceInfo devInfo(QAudioDeviceInfo::defaultOutputDevice());
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        // Start with a valid format
+        m_audioFormat = devInfo.deviceInfo().preferredFormat();
+#endif
 
         m_audioFormat.setSampleRate(rate);
         m_audioFormat.setChannelCount(2);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        m_audioFormat.setSampleFormat(QAudioFormat::Int16);
+#else
         m_audioFormat.setSampleSize(16);
         m_audioFormat.setCodec("audio/pcm");
         m_audioFormat.setByteOrder(QAudioFormat::LittleEndian);
         m_audioFormat.setSampleType(QAudioFormat::SignedInt);
+#endif
 
         if (!devInfo.isFormatSupported(m_audioFormat))
         {
-            m_audioFormat = devInfo.nearestFormat(m_audioFormat);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+            qWarning("AudioOutputDevice::start: format %d Hz 2xS16LE audio/pcm not supported.", rate);
+#else
+            m_audioFormat = devInfo.deviceInfo().nearestFormat(m_audioFormat);
             std::ostringstream os;
             os << " sampleRate: " << m_audioFormat.sampleRate()
                << " channelCount: " << m_audioFormat.channelCount()
@@ -106,19 +120,32 @@ bool AudioOutputDevice::start(int device, int rate)
                << " byteOrder: " <<  (m_audioFormat.byteOrder() == QAudioFormat::BigEndian ? "BE" : "LE")
                << " sampleType: " << (int) m_audioFormat.sampleType();
             qWarning("AudioOutputDevice::start: format %d Hz 2xS16LE audio/pcm not supported. Using: %s", rate, os.str().c_str());
+#endif
         }
         else
         {
             qInfo("AudioOutputDevice::start: audio format OK");
         }
 
-        if (m_audioFormat.sampleSize() != 16)
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        if (m_audioFormat.sampleFormat() != QAudioFormat::Int16)
         {
-            qWarning("AudioOutputDevice::start: Audio device '%s' failed", qPrintable(devInfo.defaultOutputDevice().deviceName()));
+            qWarning("AudioOutputDevice::start: Audio device '%s' failed", qPrintable(devInfo.deviceName()));
             return false;
         }
+#else
+        if (m_audioFormat.sampleSize() != 16)
+        {
+            qWarning("AudioOutputDevice::start: Audio device '%s' failed", qPrintable(devInfo.deviceName()));
+            return false;
+        }
+#endif
 
-        m_audioOutput = new QAudioOutput(devInfo, m_audioFormat);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        m_audioOutput = new QAudioSink(devInfo.deviceInfo(), m_audioFormat);
+#else
+        m_audioOutput = new QAudioOutput(devInfo.deviceInfo(), m_audioFormat);
+#endif
         m_audioNetSink = new AudioNetSink(0, m_audioFormat.sampleRate(), false);
         m_wavFileRecord = new WavFileRecord(m_audioFormat.sampleRate());
 		m_audioOutput->setVolume(m_volume);
@@ -129,7 +156,7 @@ bool AudioOutputDevice::start(int device, int rate)
         m_audioOutput->start(this);
 
         if (m_audioOutput->state() != QAudio::ActiveState) {
-            qWarning("AudioOutputDevice::start: cannot start");
+            qWarning() << "AudioOutputDevice::start: cannot start - " << m_audioOutput->error();
         }
 //	}
 //
@@ -295,8 +322,6 @@ void AudioOutputDevice::setRecordSilenceTime(int recordSilenceTime)
 
 qint64 AudioOutputDevice::readData(char* data, qint64 maxLen)
 {
-    //qDebug("AudioOutputDevice::readData: %lld", maxLen);
-
     // Study this mutex on OSX, for now deadlocks possible
     // Removed as it may indeed cause lockups and is in fact useless.
 //#ifndef __APPLE__
@@ -475,3 +500,25 @@ void AudioOutputDevice::setVolume(float volume)
         m_audioOutput->setVolume(m_volume);
 	}
 }
+
+// Qt6 requires bytesAvailable to be implemented. Not needed for Qt5.
+qint64 AudioOutputDevice::bytesAvailable() const
+{
+	qint64 available = 0;
+    for (std::list<AudioFifo*>::const_iterator it = m_audioFifos.begin(); it != m_audioFifos.end(); ++it)
+	{
+        qint64 fill = (*it)->fill();
+        if (available == 0) {
+            available = fill;
+        } else {
+            available = std::min(fill, available);
+        }
+    }
+    // If we return 0 from this twice in a row, audio will stop.
+    // So we always return a value, and if we don't have enough data in the FIFOs
+    // when readData is called, that will output silence
+    if (available == 0) {
+        available = 2048; // Is there a better value to use?
+    }
+    return available * 2 * 2; // 2 Channels of 16-bit data
+}
diff --git a/sdrbase/audio/audiooutputdevice.h b/sdrbase/audio/audiooutputdevice.h
index 411a00e2b..32e7be13d 100644
--- a/sdrbase/audio/audiooutputdevice.h
+++ b/sdrbase/audio/audiooutputdevice.h
@@ -27,7 +27,11 @@
 #include <stdint.h>
 #include "export.h"
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+class QAudioSink;
+#else
 class QAudioOutput;
+#endif
 class AudioFifo;
 class AudioOutputPipe;
 class AudioNetSink;
@@ -79,7 +83,11 @@ public:
 
 private:
 	QRecursiveMutex m_mutex;
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	QAudioSink* m_audioOutput;
+#else
 	QAudioOutput* m_audioOutput;
+#endif
 	AudioNetSink* m_audioNetSink;
     WavFileRecord* m_wavFileRecord;
 	bool m_copyAudioToUdp;
@@ -102,6 +110,7 @@ private:
 	//virtual bool open(OpenMode mode);
 	virtual qint64 readData(char* data, qint64 maxLen);
 	virtual qint64 writeData(const char* data, qint64 len);
+    virtual qint64 bytesAvailable() const override;
     void writeSampleToFile(qint16 lSample, qint16 rSample);
 
 	friend class AudioOutputPipe;
diff --git a/sdrbase/webapi/webapiadapter.cpp b/sdrbase/webapi/webapiadapter.cpp
index d5960cf89..df865087c 100644
--- a/sdrbase/webapi/webapiadapter.cpp
+++ b/sdrbase/webapi/webapiadapter.cpp
@@ -24,6 +24,7 @@
 
 #include "maincore.h"
 #include "loggerwithfile.h"
+#include "audio/audiodeviceinfo.h"
 #include "device/deviceapi.h"
 #include "device/deviceset.h"
 #include "device/deviceenumerator.h"
@@ -448,8 +449,8 @@ int WebAPIAdapter::instanceAudioGet(
 {
     (void) error;
     DSPEngine *dspEngine = DSPEngine::instance();
-    const QList<QAudioDeviceInfo>& audioInputDevices = dspEngine->getAudioDeviceManager()->getInputDevices();
-    const QList<QAudioDeviceInfo>& audioOutputDevices = dspEngine->getAudioDeviceManager()->getOutputDevices();
+    const QList<AudioDeviceInfo>& audioInputDevices = dspEngine->getAudioDeviceManager()->getInputDevices();
+    const QList<AudioDeviceInfo>& audioOutputDevices = dspEngine->getAudioDeviceManager()->getOutputDevices();
     int nbInputDevices = audioInputDevices.size();
     int nbOutputDevices = audioOutputDevices.size();
 
@@ -482,7 +483,7 @@ int WebAPIAdapter::instanceAudioGet(
         *inputDevices->back()->getName() = audioInputDevices.at(i).deviceName();
         inputDevices->back()->setIndex(i);
         inputDevices->back()->setSampleRate(inputDeviceInfo.sampleRate);
-        inputDevices->back()->setIsSystemDefault(audioInputDevices.at(i).deviceName() == QAudioDeviceInfo::defaultInputDevice().deviceName() ? 1 : 0);
+        inputDevices->back()->setIsSystemDefault(audioInputDevices.at(i).deviceName() == AudioDeviceInfo::defaultInputDevice().deviceName() ? 1 : 0);
         inputDevices->back()->setDefaultUnregistered(found ? 0 : 1);
         inputDevices->back()->setVolume(inputDeviceInfo.volume);
     }
@@ -517,7 +518,7 @@ int WebAPIAdapter::instanceAudioGet(
         *outputDevices->back()->getName() = audioOutputDevices.at(i).deviceName();
         outputDevices->back()->setIndex(i);
         outputDevices->back()->setSampleRate(outputDeviceInfo.sampleRate);
-        outputDevices->back()->setIsSystemDefault(audioOutputDevices.at(i).deviceName() == QAudioDeviceInfo::defaultOutputDevice().deviceName() ? 1 : 0);
+        outputDevices->back()->setIsSystemDefault(audioOutputDevices.at(i).deviceName() == AudioDeviceInfo::defaultOutputDevice().deviceName() ? 1 : 0);
         outputDevices->back()->setDefaultUnregistered(found ? 0 : 1);
         outputDevices->back()->setCopyToUdp(outputDeviceInfo.copyToUDP ? 1 : 0);
         outputDevices->back()->setUdpUsesRtp(outputDeviceInfo.udpUseRTP ? 1 : 0);
diff --git a/sdrgui/gui/audiodialog.cpp b/sdrgui/gui/audiodialog.cpp
index 7b8cadd4e..b379aead3 100644
--- a/sdrgui/gui/audiodialog.cpp
+++ b/sdrgui/gui/audiodialog.cpp
@@ -37,16 +37,16 @@ AudioDialogX::AudioDialogX(AudioDeviceManager* audioDeviceManager, QWidget* pare
 	// out panel
 
 	AudioDeviceManager::OutputDeviceInfo outDeviceInfo;
-	QAudioDeviceInfo defaultOutputDeviceInfo = QAudioDeviceInfo::defaultOutputDevice();
+	AudioDeviceInfo defaultOutputDeviceInfo = AudioDeviceInfo::defaultOutputDevice();
 	treeItem = new QTreeWidgetItem(ui->audioOutTree);
 	treeItem->setText(1, AudioDeviceManager::m_defaultDeviceName);
 	bool found = m_audioDeviceManager->getOutputDeviceInfo(AudioDeviceManager::m_defaultDeviceName, outDeviceInfo);
 	treeItem->setText(0, found ? "__" : "_D");
 	ui->audioOutTree->setCurrentItem(treeItem);
 
-	const QList<QAudioDeviceInfo>& outputDevices = m_audioDeviceManager->getOutputDevices();
+	const QList<AudioDeviceInfo>& outputDevices = m_audioDeviceManager->getOutputDevices();
 
-    for(QList<QAudioDeviceInfo>::const_iterator it = outputDevices.begin(); it != outputDevices.end(); ++it)
+    for(QList<AudioDeviceInfo>::const_iterator it = outputDevices.begin(); it != outputDevices.end(); ++it)
     {
         treeItem = new QTreeWidgetItem(ui->audioOutTree);
         treeItem->setText(1, it->deviceName());
@@ -65,16 +65,16 @@ AudioDialogX::AudioDialogX(AudioDeviceManager* audioDeviceManager, QWidget* pare
     // in panel
 
     AudioDeviceManager::InputDeviceInfo inDeviceInfo;
-    QAudioDeviceInfo defaultInputDeviceInfo = QAudioDeviceInfo::defaultInputDevice();
+    AudioDeviceInfo defaultInputDeviceInfo = AudioDeviceInfo::defaultInputDevice();
     treeItem = new QTreeWidgetItem(ui->audioInTree);
     treeItem->setText(1, AudioDeviceManager::m_defaultDeviceName);
     found = m_audioDeviceManager->getInputDeviceInfo(AudioDeviceManager::m_defaultDeviceName, inDeviceInfo);
     treeItem->setText(0, found ? "__" : "_D");
     ui->audioInTree->setCurrentItem(treeItem);
 
-    const QList<QAudioDeviceInfo>& inputDevices = m_audioDeviceManager->getInputDevices();
+    const QList<AudioDeviceInfo>& inputDevices = m_audioDeviceManager->getInputDevices();
 
-    for(QList<QAudioDeviceInfo>::const_iterator it = inputDevices.begin(); it != inputDevices.end(); ++it)
+    for(QList<AudioDeviceInfo>::const_iterator it = inputDevices.begin(); it != inputDevices.end(); ++it)
     {
         treeItem = new QTreeWidgetItem(ui->audioInTree);
         treeItem->setText(1, it->deviceName());
diff --git a/sdrgui/gui/audioselectdialog.cpp b/sdrgui/gui/audioselectdialog.cpp
index f33a5c89c..a01e7b381 100644
--- a/sdrgui/gui/audioselectdialog.cpp
+++ b/sdrgui/gui/audioselectdialog.cpp
@@ -33,7 +33,6 @@ AudioSelectDialog::AudioSelectDialog(const AudioDeviceManager* audioDeviceManage
 
     // panel
 
-    QAudioDeviceInfo defaultDeviceInfo = input ? QAudioDeviceInfo::defaultInputDevice() : QAudioDeviceInfo::defaultOutputDevice();
     defaultItem = new QTreeWidgetItem(ui->audioTree);
     defaultItem->setText(1, AudioDeviceManager::m_defaultDeviceName);
     bool deviceFound = getDeviceInfos(input, AudioDeviceManager::m_defaultDeviceName, systemDefault, sampleRate);
@@ -41,9 +40,9 @@ AudioSelectDialog::AudioSelectDialog(const AudioDeviceManager* audioDeviceManage
     defaultItem->setText(2, tr("%1").arg(sampleRate));
     defaultItem->setTextAlignment(2, Qt::AlignRight);
 
-    QList<QAudioDeviceInfo> devices = input ? m_audioDeviceManager->getInputDevices() : m_audioDeviceManager->getOutputDevices();
+    QList<AudioDeviceInfo> devices = input ? m_audioDeviceManager->getInputDevices() : m_audioDeviceManager->getOutputDevices();
 
-    for(QList<QAudioDeviceInfo>::const_iterator it = devices.begin(); it != devices.end(); ++it)
+    for(QList<AudioDeviceInfo>::const_iterator it = devices.begin(); it != devices.end(); ++it)
     {
         treeItem = new QTreeWidgetItem(ui->audioTree);
         treeItem->setText(1, it->deviceName());
@@ -113,7 +112,7 @@ bool AudioSelectDialog::getDeviceInfos(bool input, const QString& deviceName, bo
     {
         AudioDeviceManager::InputDeviceInfo inDeviceInfo;
         found = m_audioDeviceManager->getInputDeviceInfo(deviceName, inDeviceInfo);
-        systemDefault = deviceName == QAudioDeviceInfo::defaultInputDevice().deviceName();
+        systemDefault = deviceName == AudioDeviceInfo::defaultInputDevice().deviceName();
 
         if (found) {
             sampleRate = inDeviceInfo.sampleRate;
@@ -125,7 +124,7 @@ bool AudioSelectDialog::getDeviceInfos(bool input, const QString& deviceName, bo
     {
         AudioDeviceManager::OutputDeviceInfo outDeviceInfo;
         found = m_audioDeviceManager->getOutputDeviceInfo(deviceName, outDeviceInfo);
-        systemDefault = deviceName == QAudioDeviceInfo::defaultOutputDevice().deviceName();
+        systemDefault = deviceName == AudioDeviceInfo::defaultOutputDevice().deviceName();
 
         if (found) {
             sampleRate = outDeviceInfo.sampleRate;