The “forbidden” connection in the manual is both plugging an amp speaker jack into one 1/4” jack and an instrument in the other, which could be dangerous as the jacks are passively run in parallel so you could get shocked (it’d be like plugging an instrument into the speaker jack of the amp). You could definitely run two instruments in, but if they are both passive then they would load on each-other and the tone of both would suffer. Two active/buffered inputs like two lines of a pedalboard with active effects or two active basses should work fine.Let me know if you try it. I was under the impression it was not allowed, that it would be like trying to run 2 instruments at once, which manual forbids. Have you already tried it?
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