> I'll do it, but right now I'm in a bit of a fight with the OpenGL standard
> concerning the dimensions of textures.

Sorry, can't help ya there. :)

I think the situation is under control now, though I do feel that OpenGL looks more like a list of recommendations than like a real standard now.

I wrote MIDI and OSC looper libraries for Processing, so I am familiar
with the necessary functionality.

Base functionality isn't that hard, I think. What is hard about looping and what makes some pedals worth the money is a really good interface

I'm not sure how to push LiSa's
buttons though.

Fortunately "LiSa's buttons" are quite well documented in the /special/ directory of the ChucK examples. LiSa is absolutely wonderful, as far as UGens go.

And has anyone written a Stack data structure for
ChucK? That would be useful for the undo/redo bits.

I think I'd use a array of arrays with two pointers. I've never done this and am not sure about how this would fare performance-wise. I could imagine a "sample" data-type that SndBuf and LiSa could read from and write to, with memory buffering.

Kas.