Well... if you load a MIDI SuperTrack on the melody track, it's not going to just load a patch to play the existing MIDI melody, it's going to load in a complete instrument track (like a RealTrack, except MIDI). In addition it may load in a HiQ instrument (using the Sforzando plugin) for the MIDI sounds.

So it's unclear what you are saying ... if you look at the Mixer window, on the Plugins tab what do you see on the Melody track? Is a plugin loaded, and what patch/instrument is selected? If no plugin is loaded, it *should* be using the default Apple DLS synth, and you could try selecting different GM instruments, like 1.Acoustic Piano and 26.Acoustic Guitar (for example) to see if you hear any difference.

Andrew
PG Music Inc.