We can consider this but it would be a lot to sort out how this could work.
MIDI CC messages cannot load specific Programs on the H90. You can use CC messages to increment/decrement the Playlist and load them that way. https://cdn.eventideaudio.com/manuals/h90/1.7.1/content/appendix/global.html
You can load specific Programs from the Playlist using PC messages.
I would suggest checking out some multi-FX algorithms, such as SpaceTime or ModEchoVerb. These have a combination of delay/modulation/reverb etc. You can use Hot Switches to recall different states of the preset without loading a new preset (this can be done via MIDI). So you could, for example, use reverb and record your first loop, and then activate a Hot Switch that changes the existing preset to a sound with modulation and delay for overdubs.
