diff --git a/dfm/dfm06s b/dfm/dfm06s
index 89cf083..b14820c 100755
Binary files a/dfm/dfm06s and b/dfm/dfm06s differ
diff --git a/imet/imet1ab.c b/imet/imet1ab.c
index e2295d5..702a5ed 100644
--- a/imet/imet1ab.c
+++ b/imet/imet1ab.c
@@ -143,7 +143,7 @@ int read_signed_sample(FILE *fp) {  // int = i32_t
 }
 
 
-int par=-1, par_alt=-1;
+int par=1, par_alt=1;
 unsigned long sample_count = 0;
 
 int read_afsk_bits(FILE *fp, int *len) {
@@ -153,19 +153,19 @@ int read_afsk_bits(FILE *fp, int *len) {
 
     start = 0;
     n = 0;
-    do{
+    do{ // High
         sample = read_signed_sample(fp);
         if (sample == EOF_INT) return EOF;
         if (option_inv) sample = -sample;
         sample_count++;
-        if (sample > 0 && !start) continue;
+        if (sample < 0 && !start) continue;
         start = 1;
         par_alt = par;
         par =  (sample >= 0) ? 1 : -1;
         n++;
     } while (par*par_alt > 0);
 
-    do{
+    do{ // Low
         sample = read_signed_sample(fp);
         if (sample == EOF_INT) return EOF;
         if (option_inv) sample = -sample;
@@ -420,6 +420,7 @@ int bitl1 = 0,
             fprintf(stderr, "%s [options] audio.wav\n", fpname);
             fprintf(stderr, "  options:\n");
             fprintf(stderr, "       -r, --raw\n");
+            fprintf(stderr, "       -i, --invert\n");
             return 0;
         }
 /*
diff --git a/rs41/rs41stdin.c b/rs41/rs41stdin.c
index 98943ba..a61ceb8 100644
--- a/rs41/rs41stdin.c
+++ b/rs41/rs41stdin.c
@@ -179,7 +179,8 @@ int par=1, par_alt=1;
 unsigned long sample_count = 0;
 
 int read_bits_fsk(FILE *fp, int *bit, int *len) {
-    int n, sample=0, y0;
+    static int sample;
+    int n, y0;
     float l, x1;
     static float x0;
 
@@ -203,8 +204,8 @@ int read_bits_fsk(FILE *fp, int *bit, int *len) {
 
     *len = (int)(l+0.5);
 
-    if (!option_inv) *bit = (1-par_alt)/2;  // unten 1, oben -1
-    else             *bit = (1+par_alt)/2;  // inverse
+    if (!option_inv) *bit = (1+par_alt)/2;  // oben 1, unten -1
+    else             *bit = (1-par_alt)/2;  // sdr#<rev14?, invers: unten 1, oben -1
 
     /* Y-offset ? */
 
@@ -655,6 +656,7 @@ int main(int argc, char *argv[]) {
             fprintf(stderr, "  options:\n");
             fprintf(stderr, "       -v, --verbose\n");
             fprintf(stderr, "       -r, --raw\n");
+            fprintf(stderr, "       -i, --invert\n");
             return 0;
         }
         else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
diff --git a/rs92/rs92gps.c b/rs92/rs92gps.c
index fdffe02..c5e5afd 100644
--- a/rs92/rs92gps.c
+++ b/rs92/rs92gps.c
@@ -236,8 +236,8 @@ int read_bits_fsk(FILE *fp, int *bit, int *len) {
 
     *len = (int)(l+0.5);
 
-    if (!option_inv) *bit = (1-par_alt)/2;  // unten 1, oben -1
-    else             *bit = (1+par_alt)/2;  // inverse:
+    if (!option_inv) *bit = (1+par_alt)/2;  // oben 1, unten -1
+    else             *bit = (1-par_alt)/2;  // sdr#<rev14?, invers: unten 1, oben -1
 
     /* Y-offset ? */
 
@@ -924,6 +924,7 @@ int main(int argc, char *argv[]) {
             fprintf(stderr, "       -r, --raw\n");
             fprintf(stderr, "       -a, --almanac  <almanacSEM>\n");
             fprintf(stderr, "       -e, --ephem    <ephemperisRinex>\n");
+            fprintf(stderr, "       -i, --invert\n");
             return 0;
         }
         else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
diff --git a/rs92/rs92gps_rawin.c b/rs92/rs92gps_rawin.c
index 9f61d41..49c00ab 100644
--- a/rs92/rs92gps_rawin.c
+++ b/rs92/rs92gps_rawin.c
@@ -231,8 +231,8 @@ int read_bits_fsk(FILE *fp, int *bit, int *len) {
 
     *len = (int)(l+0.5);
 
-    if (!option_inv) *bit = (1-par_alt)/2;  // unten 1, oben -1
-    else             *bit = (1+par_alt)/2;  // inverse:
+    if (!option_inv) *bit = (1+par_alt)/2;  // oben 1, unten -1
+    else             *bit = (1-par_alt)/2;  // sdr#<rev14?, invers: unten 1, oben -1
 
     /* Y-offset ? */
 
@@ -942,6 +942,7 @@ int main(int argc, char *argv[]) {
             fprintf(stderr, "  options:\n");
             fprintf(stderr, "       -v, --verbose\n");
             fprintf(stderr, "       -r, --raw\n");
+            fprintf(stderr, "       -i, --invert\n");
             fprintf(stderr, "       -a, --almanac  <almanacSEM>\n");
             fprintf(stderr, "       -e, --ephem    <ephemperisRinex>\n");
             fprintf(stderr, "       -g1         (verbose GPS:   4 sats)\n");