(Temporarily?) resolved issue with no transmit output. It looks like

switching dacVolumes around from transmit to receive wasn't working as
expected.  Transmit audio through the DAC stayed muted.  If I need to
use that for smooth audio transitions, I'll need to do some more
research.

audio.h

@@ -9,24 +9,24 @@
 
 enum RxInput {
   RX_RIG_IN = 0,
-  RX_USB_IN,
+  RX_USB_IN = 1,
 };
 
 enum RxOutput {
   RX_SPEAKER_OUT = 0,
-  RX_LINE_OUT,
+  RX_LINE_OUT = 1,
-  RX_USB_OUT,
+  RX_USB_OUT = 2,
 };
 
 enum TxInput {
   TX_MIC_IN = -1,
   TX_LINE_IN = 0,
-  TX_USB_IN,
+  TX_USB_IN = 1,
 };
 
 enum TxOutput {
   TX_RIG_OUT = 0,
-  TX_USB_OUT,
+  TX_USB_OUT = 1,
 };
 
 void audioInit();

audio.ino

@@ -72,10 +72,10 @@ void audioInit()
   audioCtrl.lineInLevel(iopConfig.rxRigInLevel, iopConfig.txLineInLevel);  // NOTE: need to see if this persists through input changes (see mic gain...)
   audioCtrl.lineOutLevel(iopConfig.rxLineOutLevel, iopConfig.txRigOutLevel); // NOTE: need to see if this persists through input changes (see mic gain...)
   audioCtrl.micGain(iopConfig.txMicInGain);  // superfluous, as I have to do this anytime I switch to mic for some reason
-  audioCtrl.dacVolumeRamp();  // if this seems too slow, might try dacVolumeRampLinear().
+  //audioCtrl.dacVolumeRamp();  // if this seems too slow, might try dacVolumeRampLinear().
-  audioCtrl.dacVolume(1.0, 0.0);  // we're going to mute TX audio via the DAC unless we're transmitting
+  //audioCtrl.dacVolume(1.0, 0.0);  // we're going to mute TX audio via the DAC unless we're transmitting
 
-  // selectTxInput(TX_LINE_IN);
+  audioSelectTxInput(TX_MIC_IN); // superfluous I think
 }
 
 inline void updateRxRigIn()
@@ -216,7 +216,7 @@ void audioTransmit()
     // zero while we change other mixer settings, to try to use the
     // DAC's volume ramping to minimize pops.  
     // NOTE:  Might need to add a brief delay?
-    audioCtrl.dacVolume(0.0, 0.0);      
+    //audioCtrl.dacVolume(0.0, 0.0);
      
     // Next mute the incoming RX audio.  Can't think of a good reason
     // to let RX audio in while we're transmitting.
@@ -249,7 +249,7 @@ void audioTransmit()
 
     // Allow both transmit and receive audio output channels.  This is safe
     // because the RX input is muted, and we might want to inject something else.
-    audioCtrl.dacVolume(1.0, 1.0);
+    //audioCtrl.dacVolume(1.0, 1.0);
   }
 }
 
@@ -264,7 +264,7 @@ void audioReceive()
     // First we're going to set the RX and TX audio DAC volumes to
     // zero while we switch inputs, because the DAC volumes can be
     // smoothly ramped by the SGTL5000 to avoid pops.
-    audioCtrl.dacVolume(0.0, 0.0);      
+    //audioCtrl.dacVolume(0.0, 0.0);      
       
     // Mute the mic, since we're going to be switching back to line
     // input for RX and TX.
@@ -280,7 +280,7 @@ void audioReceive()
 
     // Now bring back up the DAC volumes.  Hopefully this reduced pops...
     // When going back to receive, we leave transmit DAC at zero.
-    audioCtrl.dacVolume(1.0, 0.0);
+    //audioCtrl.dacVolume(1.0, 0.0);
   }
 }
 

config.h

@@ -75,8 +75,8 @@ struct IOPConfig {
   float   txUSBInVol     = 0.7;
   float   txUSBInCal     = 1.0;
   // rig-out parameters (TX) - default settings are based on hitting 70% of 25mVrms w/ mic
-  uint8_t txRigOutLevel  = 29; //31;
+  uint8_t txRigOutLevel  = 31;
-  float   txRigOutCal    = 1.0; //0.043;
+  float   txRigOutCal    = 0.043;
   // USB-out parameters (TX)- debug/monitor use only
   bool    txUSBOutEnable = true;
   float   txUSBOutCal    = 1.0; 

ubitx_iop.h

@@ -15,8 +15,8 @@
 
 enum RigMode {
   MODE_SSB = 0,
-  MODE_DIGI,
+  MODE_DIGI = 1,
-  MODE_CW,
+  MODE_CW = 2,
 };
 
 extern RigMode rigMode;

ubitx_iop.ino

@@ -7,7 +7,7 @@
 #include <Bounce2.h>
 #define BOUNCE_WITH_PROMPT_DETECTION
 
-RigMode rigMode;
+RigMode rigMode = MODE_SSB;
 IOPConfig iopConfig;
 
 #define MIC_PTT_PIN 21