Thanks Roger, that does look handy. Now, even though my stalk (at least the Vol+ and Vol- buttons that I'm sure about) appears to be in the correct range, Vol+ is 0.86 kΩ too high and Vol- is 1.62 kΩ too low, but both SHOULD give me something on the serial console when Hijack has stalk_debug=1.

The interesting thing here is that my Up and Down buttons which have AT MOST 12 kΩ give me FF on the serial console, so it does point to something being askew on the Tuner which is making it 'top out'.

I am going to try bridging the 22 kΩ resistor R2 in the tuner. It sounds like the right thing to do.

I'd appreciate it if anyone lets me know if they think I'm going about this the wrong way or I should try something else first - I'm really no expert on this kind of stuff.