On the left hand portion of the screen, toward the top, above the patch [GM] button, under the [User] button, to the right of the track select [T] button, to the left of the title display.

Keep in mind it works a little differently than a mixer's solo button.

From the help file:

Quote:

You can toggle RealBand in and out of Solo mode by pressing the Solo button. When in Solo mode, you will only the currently selected group of tracks (assuming you haven't muted them). You won't hear any of the other tracks. The Solo button will remain pressed to indicate RealBand is in Solo mode.





You could also mute every other track to solo the vocs.


BTW: This would probably fit better in the RealBand forum.