Hi Ok ive tried the demo and the music rebalance is as very good .Especially if you just want to tweak a bit the balance lower the base and higher the vocals kinda thing.As for isolation ive isolated some pop songs and its by far the closest to isolating a vocal.I find it useful for learning how the production was put together .It should be good for karoake as you can automatically make a the original backing track(no doubt copyright issues) but if you want to practice ur skill against the original it would be very good.Not gone on UI of Rx ,its not as good as their other interfaces ...Just may thoughts after trying the demo