Since I have no mod wheel on my main keyboard, I've been using an old synth stacked to the side and chained to the main keyboard.
Needless to say, I'd rather have a basic midi controller. I found this one, which is specifically made for DJ's, but it looks to me like it would work fine with GPO and my keyboard. Am I wrong?
If anyone thinks they need to talk me out of this, let me know.