Well, the main one is that I've always been a little fuzzy on what the Filter Cutoff MIDI control does. Is that in relation to the VCF block? And now with the Expression control as "an alternative," I'm not sure what that does either.
5sg.
I’m really glad you asked. That is explained in the manual, but I think it could be made clearer. I might include that as an FAQ.
CC11 and 74 both control the filter cutoff using the range set by “VCF” in the global menu. That is selectable between 1, 2 and 4 octaves. What this means is that the pedal can move the cutoff up to 1, 2 or 4 octaves away (in either direction) from the cutoff frequency that is set in the patch. (So accordingly the pedal either has a 2-, 4- or 8-octave sweep.)
The easiest way to explain this is by using the “vintage” filter setting. It has a range of 0-80 and is scaled at 10 units per octave.
Let’s say we set its cutoff at its mid-point of 40 as it makes the example easier.
If you set “VCF” in the global menu to 1 octave then at the point the program loads, the cutoff will still be at 40.
If you move the pedal to the toe-up position, the cutoff will move 1 octave down to 30.
If you move the pedal to the toe-down position, the cutoff will move 1 octave up to 50.
Set “VCF” to 2 in the menu. Now a base cutoff off 40 would be swept between 20 and 60 at toe-up and toe-down respectively. (2 octaves either side.)
Set “VCF” to 4 in the menu. Now a base cutoff of 40 would be swept across the entire range from 0 to 80 at toe-up and toe-down respectively. (4 octaves either side).
If the cutoff is set anywhere else than the centre point then, depending what the global setting is, you might have more adjustment range in one direction compared to the other. E.g. set “VCF” to 4 octaves in the menu and the cutoff to 20. Normally you’d be able to adjust 40 steps on either direction but since there are only 20 steps from 20 to 0, that’s as far as you’ll be able to go in that direction. So the usable range in this case will be 0-60.
Does that make sense?