My DX7 is having troubles with midi. I can't load any patches to or from my PC. I have SBLive with a midi interface connected to it. The DX7 is sending midi events out correctly, if it's played "nicely", but when several notes are played rapidly or mod wheel is moved, it gives some strange controller and aftertouch messages.

Has anyone experienced similar problems? I'm wondering if the problem could be in the coupling circuitry of the midi in/out.