As mentioned above, the Metal Soloists already solo based on the key of the song, not the chords.
You can control this as follows:
1. If you enter a power chord, then it will solo over that chord's root for the duration of that chord.
2. You can enter a song ke signature change at any bar, in that case it will solo over the new key signature (that is how you could get it to change to a Bbm chord, and solo over a Bb scale for example.

All other RealTracks don't work like this (ie they solo over the chord changes), just the Metal ones work like this.


Have Fun!
Peter Gannon
PG Music Inc.