FIX_BITS default to 0.

Author: wb2osz

src/audio.h

@@ -151,6 +151,17 @@ struct audio_s {
 
 	struct achan_param_s {
 
+	    // Currently, we have a fixed mapping from audio sources to channel.
+	    //
+	    //		ADEVICE		CHANNEL (mono)		(stereo)
+	    //		0		0			0, 1
+	    //		1		2			2, 3
+	    //		2		4			4, 5
+	    //
+	    // A future feauture might allow the user to specify a different audio source.
+	    // This would allow multiple modems (with associated channel) to share an audio source.
+	    // int audio_source;	// Default would be [0,1,2,3,4,5]
+
 	    // What else should be moved out of structure and enlarged when NETTNC is implemented.  ???
 	    char mycall[AX25_MAX_ADDR_LEN];      /* Call associated with this radio channel. */
                                 	/* Could all be the same or different. */
@@ -415,7 +426,8 @@ struct audio_s {
 
 #define DEFAULT_BITS_PER_SAMPLE	16
 
-#define DEFAULT_FIX_BITS RETRY_INVERT_SINGLE
+#define DEFAULT_FIX_BITS RETRY_NONE	// Interesting research project but even a single bit fix up
+					// will occasionally let corrupted packets through.
 
 /* 
  * Standard for AFSK on VHF FM. 
@@ -445,11 +457,11 @@ struct audio_s {
  */
 
 #define DEFAULT_DWAIT		0
-#define DEFAULT_SLOTTIME	10
+#define DEFAULT_SLOTTIME	10	// *10mS = 100mS
 #define DEFAULT_PERSIST		63
-#define DEFAULT_TXDELAY		30
-#define DEFAULT_TXTAIL		10	
-#define DEFAULT_FULLDUP		0
+#define DEFAULT_TXDELAY		30	// *10mS = 300mS
+#define DEFAULT_TXTAIL		10	// *10mS = 100mS	
+#define DEFAULT_FULLDUP		0	// false = half duplex
 
 /* 
  * Note that we have two versions of these in audio.c and audio_win.c.