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The expression pedal mapping / HotKnob setting is saved within a preset. Perhaps there’s another parameter already saved to the HotKnob [HOT +]? When you dial in another HotKnob setting, you may be ‘adding’ to what’s already there?
Quick question: Are you trying all this in the H9 Control app, or from the H9 unit itself? It’ll help to flesh out the answer.
I don’t know that you can control a single parameter with two different switches. You can control two different parameter value positions with a single switch (momentary). The same goes for HotSwitch / Performance Switch programming.
Perhaps you can set Mix to zero directly [Set Parameter 1] with one switch, and Mix to 50 with the other switch [using HotSwitch / Performance]. I’ll have to look into this, and get back to you.
They’re locked into the ten parameters in each algorithm. ‘Set Parameter 1’ is always some variation on the dry/wet Mix. ‘Set Parameter 2’ is usually (but not always) a Channel 1 / Channel 2 mix. Left-to-right; top-to-bottom in the H9 Control app. One parameter for each ‘knob’, the precedent being the physical controls on ModFactor / TimeFactor / PitchFactor / Space ‘boxes.