Trying to help my Dad out here. He was using and old Roland daughterboard that attached to an ISA Soundblaster 16 sound card. The card, or perhaps the slot stopped working. Upgraded him to a newer system.. Problem is he doesn't like the sound of the Forte, or TTS-1. I tried hooking up his Roland SD-35 via USB MIDI interface and that works, however, it often gets a bFL error message which means buffer full. The folks at Roland told me to turn off "soft thru" on the SD-35, but when I did that, then I got no sound at all. So I don't know how to fix this buffer full problem that comes up randomly. Is this common when using a hardware synth via USB MIDI interface? What other options are there? Are there any sound cards that exist that have good sounding general midi sounds built into them? It's hard to believe that the old Roland sounds from the 1990s sound better than the stuff in existence today.. What am I missing here?