Have you downloaded the patch map for the Roland SD50 from here?

https://www.pgmusic.com/support_miscellaneous.htm

And then, when selecting the MIDI patch, choose Higher Bank Patch and then Open *.PAT to load the correct patch map, before selecting the patch from the pull-down on the left? I'm simplifying the steps here because I assume you know thenm and did them, but if not, I can give step-by-step instructions. Please excuse me if you know this, but it's often helpful in diagnosing a problem not to assume anything. [With any MIDI external synth, to get sounds that are not General MIDI (GM), you must first load the appropriate patch map for your MIDI synth.]


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