Okay, I have Sonic SE v3, not v2. I think v2 got overwritten when I upgraded my Cubase Artist to the latest version. In version 3, you can definitely set it for GM mode (see below). I also loaded a MIDI file onto the Melody track and everything played properly (with or without the style enabled).

Since I don't have Sonic SE v2 anymore (Steinberg seems to deactivate previous versions when you upgrade), I can't test that one unfortunately. But Sonic SE v3 definitely works as a GM synth for BIAB.

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John

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