I think Diablo at one time had a claim that you could switch tunes on the fly. But noone else has done it, so I am not hopeful of the results. Though it seems simple programmatically (just an IF THEN branch), there must be a reason the reputable guys DON'T do it. Might be the whole GTDI setup is too "finicky" and does not like on-the-go logic switching, maybe it's the transmission, ...?