It requires a computer for setting up the patches and they can be changed via Program change messages. . . . so I’m told. I’ve not been able to get mine to work like that. I just set mine up for one patch I use and it starts up with that every time.
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fwiw - the patches can be changed with momentary switches (a bit like the pedal you’d get with a guitar amp) - i built two into a jack plug, one switches up, the other down
it’s almost certainly better to have a few utility midi thru/merges etc tho