luthifer

The type of truss rod would seem to matter as well?

Interesting! I've always suspected the neck would be a key ingredient. That and the pickup aperture and placement would seem to be the main contributors to the harmonic signature? And strings of course.

I'm working on a "pick attack", I'll have something this year. It's not hard to implement; more a matter of testing different designs for sound qualities, and deciding exactly how to fit it into the modular scheme. Right now I'm testing a filter that can function similar to the Wal (in the schematic above) but a different topology that can do other things as well. My goal isn't to copy a Wal, but it should sound pretty close when tuned the same.

Underhill chap here! Nice to get a look at the circuit, thanks for the work Kinkh. What jumps out at me is the deliberate phase reversal of the pick attack. It makes sense since the phase above cutoff is also reversed? The Q switching scheme is also not what I expected!