Anyway what we're looking at doing right now is really simple... think about how it and tell me if this would work for you.
We're thinking about doing this basically as an option for Quad Mode... so quad mode would have a choice of working exactly like it does now, or (the new option) exactly like it does now except that turning on one channel automatically turns off the previous channel. Remember the radio selector buttons in old car stereos? (some folks might be too young to know what I'm talking about) -- like that.
So, as far as what the pedal does when you turn on a channel now... this would not change. The way it works now is that expression channels have an "initial value" that is programmable, and that's the voltage that gets output when you first turn on a channel. Then whenever you move the expression pedal after that, the output snaps to the real pedal position. One-channel-at-a-time mode would work the same way.
As far as channels that you turn off, meaning the previously-active channel if we are talking about one-button mode, what should happen is that the output of that channel stays at exactly whatever it was when you switched channels. In the case of LFOs, you have different "off modes" that control what the LFO does when a channel is off. It can freeze at its last instantaneous value, can turn off completely, or can keep running as an LFO, only with no further influence from the expression pedal once the channel is off.
So let me know if a set-up like I just described here would work for you guys.
Thanks!
-Amos
