>>I wonder how tough it'd be to hack a DL4 to use a volume (or expression) pedal for a feedback control?<<
now, why would you want to do it that way?
wouldn't it be a darn sight easier to use the expression pedal socket the thing already has and set up y'r three presets to do things in response to the pedal? I used mine like this for quite a while (an ordinary volume pedal, but I had to reverse tip and ring connections inside it's jack to make it work- this saved me $60 or whatever line6 wanted for their pedal). I had it set up to alter both delay time and feedback at the same time, but you can have the pedal affect any or all of the knobs except the main algorithm selection.
so you plug the pedal in, make your adjustments with the heel-down position, make some more with the toe-down position and save the preset as normal. or something like that.
but you could easily rewire the feedback control through an added stereo jack on the back of the box, so that a pedal plugged into this new jack socket would control feedback. thing is, it would be subject to the same "rules" as the original one, i.e. another expression pedal would over-ride it, as would the preset value for feedback.......
if I was going to hack a dl4, I'd want the midi clocking and some way to stop the echoes cutting off when I change preset; any remaining echoes from the "old" preset should continue but with the new settings acting on them. as it stands, they just lop off abruptly. I have the dl4 set up so that the echoes continue when an effect is bypassed, but there's no way to have them carry over when you change presets.
d.
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