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Mono guitar in. Stereo out from 1/2. Some presets from the factory are only coming out of my left speaker. What gives?
What pedal are you working with?
If it’s the H90, are you sure you’re connecting to Input 1 for mono?
In 1 out 1/2
I just checked that Twin Pines Program in your (In 1 / Out 1/2) configuration. Definitely dry & wet out both speakers.
All that immediately comes to mind for diagnostic purposes: Check your System – I/O – Jacks to confirm that the H90 is sensing both outputs correctly.
Or you can try Bypassing the Polyphony Preset, to isolate the Prism Shift Preset. The way it’s configured, you should be getting the High to Low voices panning right to left (-0.8 Spread).
I dont know what happened but no cableing changed and everything is OK today. About a handful of factory presets were mono(L). Something funky with the control app? I truly dont know.