[BIAB-Audiophile-2016] [Windows7-HP] [Toshiba-X775-Qosmio] [NI-Bandstand as Default Multi-timbrel Synth]

I am finding that when I play the MIDI-Super-Track-Demos the piano usually switches out to a vibe. This happens always on the first or second measure of the second chorus. At the ending of the song, the instrument changes again to a saxophone. Some Super-Tracks play normally without this bizarre behavior.

Any ideas what might be happening here?