I use my old roland keyboard to play a ketron sd2. I have a usb midi in out interface, and can select the sound I want to play. I used to use the same setup with a softsynth that comes bundled with biab, first VSC, then VSC Dxi. All three worked fine, with no issues. The key sends the midi data to what you choose as your synth and permits you to play the software syth of your choice.

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John Conley
Musica est vita