Hi.
Another vote for "nope", no harm done.
Like said, it's as old a trick as four input, two channel pre sections: Marshall, Fender, Hiwatt, Monster etc.
Back in the day when I bought my Monster, I stumped the clerc completely by linking the two channels. He rushed from the back room and accused me of trying one of the expensive vintage amps in the shop. After hearing the channels linked, he even tried to increase the asking price

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Regards
Sam