I do use a Trash Panda Quad for switchable expression, with active control over each output. I can’t speak to the Saturnworks, but it’s of a passive design (power required only for the LEDs). I don’t know how well the H90 will react to that, regarding calibration, potential for voltage division, etc.
This quote bothered me a little, as it’s contradicts the H90 spec:
Expression pedals fall into two broad categories: the more common TRS (stereo) configuration and less common TS (mono) configuration. EHX, Boss, Dunlop, Strymon, Moog, and many others use TRS. A handful of brands, including Line 6 and Eventide, use TS.
EXP/CTL
Two ¼” tip/ring/sleeve input jacks for a variety of parameter mapping and assignment options. Accepts the following:
10-25 K expression pedals.
As did this one:
Please note: The controller is designed to only have one device active at a time. Having more than one device switched on at the same time may cause the device(s) to malfunction.
Saturnworks devices are very configurable, pre-purchase. I’d contact them directly, and perhaps Eventide or another end user can chime in here on the specifics.
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