Here’s an Osmose preset to demonstrate how you can change the Aftertouch effect using a Pedal (or Osmose Mod slider as Pedal2 is used). This is a case where a Blend function comes in handy. This preset applies a vibrato which cross faded to filter cutoff on increasing Macro Controller i which controls two Blend functions.
On formula F, Y controls the frequency of the Shape Generator that creates the vibrato applied to OSC1. When i is min Y will induce the vibrato as normal – increasing frequency to max Y (so vibrato will speed up but only be applied in the Aftertouch area). As i is increased Y shape moves to zero so that at max i value, Y=0 and thus now vibrato will be imposed because vibrato frequency is zero.
The output from the OSC1 is sent to a low pass filter and the output of the filter is what you will hear. On formula D, X controls cutoff added to Y. So the filter will be active at all times but not create a cutoff effect until Y starts increasing. Formula D uses a blend on i as well, but here instead of decreasing the Y effect as i is increased it increases Y cutoff control. So as you bring up Y, the cutoff effect increases until at max Y the full Y frequency is used for cutoff (of course you could change the Y cutoff frequency to have a greater to lesser effect). A LP Bandwidth control is added so you can adjust the amount of cutoff effect.
So that’s the basics for one way to do this. Use a blend (on some controller) that on one formula increases Y to do something and in another formula and in another use the same controller to blend so that Y decreases the effect. There will be other ways to do this. But this is a simple way that’s pretty easy to understand.
Macro Controllers:
i (vibXCut): Uses i (set to Pedal 2/Mod Slider) to change Y aftertouch effect from 100% vibrato to 100% filter cutoff. Note formula J adjusts output level down a bit as you bring up the cutoff as that tends to increase the volume. You can play with this value to adjust as you like. If the cutoff frequency is too large not large enough for you change the Y value in the Secondary of Formula D.
ii (vibWidth): Changes width of the vibrato that will increase in frequency with Aftertouch pressure. IF the max vibrato frequency is to fast ot too slow for you, change the Y value in the primary of formula F.
iii (resonance): Changes the flow pass filter Bandwidth. Set low to get the max cutoff effect.
iv (timbre): Changes timbre by adjust spectral balance in combination with the self-modulation feedback applies to OSC1.
v (chorus): Adds a simple 180 degrees out of phase chorusing effect while also increasing reverb mix a bit.
vi (release): Adds sustain after a note is released
Ped1: Sustain
Ped2 (Mod Slider): Changes Aftertouch Vibrato to Filter cutoff effect.
