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Hi all,
I've been trying out mGB 1.3.3 with a homemade Teensyboy on Game Boy Color. Have tried on three different carts; Drag'n'Derp, as an extra ROM on nanoloop one, and on an EPROM cart.
It works perfectly well on the Derp. On the other carts, program changes and CC work, notes *seem* to get through (the indicator flashes above the appropriate channel), but there's no sound.
Has anyone encountered similar problems? I'd like to use one of the non-derp carts if possible.
Same behaviour when using the nanoloop MIDI adapter as well. 
I suspect it has something to do with the fact that the EPROM and nanoloop one cart don't really allocate any SRAM storage for mGB to place its presets. Try holding B then pressing A when the screen with icons/waveforms shows up. On carts lacking SRAM that I have, mGB likes to panic and output some garbage icons because it wants to load saved presets, but can't.
That did the trick, thanks MaxDolensky! All carts working happily now.
Not a problem. Wish Kitsch and I had discovered this earlier at Moogfest <_< had to disable one of the demo DMGs we had since neither of us thought to investigate MIDI panic (B + A) when one of the units freaked out.