Is there a definitive description of the serial interface to the tuner module?
From what I can see of past discussions, information is very sketchy. Could
Patrick or Hugo oblige with a complete list?

Here's what I have gleaned from past posts:

http://empeg.comms.net/php/showthreaded.php?Cat=&Board=hackers_prog&Number=76423
Responses from the Tuner always always always begin with 0x01

http://empeg.comms.net/php/showthreaded.php?Cat=&Board=hackers_prog&Number=76416
...the 3 byte init string Hugo originally sent me of 0x01, 0x00, 0x01

http://empeg.comms.net/php/showthreaded.php?Cat=&Board=empeg_tech&Number=95104
There are 2 parameters which define when the tuner will send a stalk command
0x01 0x08 <fuzz> <loops>

http://empeg.comms.net/php/showthreaded.php?Cat=&Board=empeg_tech&Number=37787
0x02 - indicates a command from the stalk interface
0x00 / 0x01 - indicates that the shift switch is off / on
ADC1 first sample read from the remote
ADC2 second sample read from the remote

http://empeg.comms.net/php/showthreaded.php?Cat=&Board=hackers_prog&Number=81713
To read the knob, send "0x01 0x09", and the Tuner will reply with
"0x01 0x09 0x0y 0x(9+y)", where "y" is the dial setting.