You’re welcome. The H90’s insert send/return/mix parameters are not able to be mapped to external controllers, but we may add this feature in a future update.

If the Eclipse will always be in the insert path on the H90, your best bet would be to map an expression pedal/MIDI controller to the output gain of the Eclipse. This way, when you turn the output gain level down, there is no dry signal on the H90’s insert path. This also allows you to use the expression pedal as a level control for the Eclipse.

You could even connect the expression pedal to the H90, and then convert that to MIDI using the H90’s MIDI transmit. This would allow you to send MIDI PC and CC messages to the Eclipse from the H90.

https://cdn.eventideaudio.com/manuals/h90/1.5.2/content/system-menu/midi.html