So Goattracker has a learning curve like a brick wall, huh? This is the song where I finally figured it out and got comfortable with it. Original version was called 'sid_is_hard', and I stand by that :P
Sounds ok on both 6581 and 8580, depending on emulator. I think it sounds better on 6581 though. Haven't attempted playback on actual SID yet. MP3 is from SIDPlay for Windows.