AFAIK, the JP isn't really a multitimbral synth, which means it'll only play one sound at a time. There are a couple ways around that, however. One way is to change the key mode to 'Split', so that two different patches are available above and below Middle-C. The other (and easier) way is to simply record audio from the JP into cubase, then that will free up the MIDI bus for other sounds.

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thankss it worked

Bought myself a JP-8080 a few days ago, really nice synth

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