The masterGain method had the same bug as samplerateOffset; it only used the low two bits of the output channel.

Author: billpugh

Tsunami.cpp

@@ -180,7 +180,7 @@ uint8_t txbuf[8];
 unsigned short vol;
 uint8_t o;
 
-	o = out & 0x03;
+	o = out & 0x07;
 	txbuf[0] = SOM1;
 	txbuf[1] = SOM2;
 	txbuf[2] = 0x08;