I would hope that this KEYS-Lock feature would be invested in in the near future. At least for me, it’s one of the best features of jamming. However, I would miss some improvements. At least one improvement could be that those empty "X"s would be left out of the white ones and the notes would be consecutively on the white keys. It would make jamming easier. You probably understand what I mean.
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I agree
Currently, keys-lock works sometimes like a charm
But other times there is no way to make a solo, and it’s a shame 
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