Would be a 5 with one trivial feature added in

I have a Tascam Vocal Trainer MP-VT1 which does vocal elimination by simply subtracting the L&R channels playing the mono result. So I use my Tascam instead of this app because some tracks I sing with are not Karaoke.

(There is a more advanced band limited subtract the Tascam can do but it is a very subtle improvement over the simple method.)

Adding simple vocal elimination would make this App a 5!

JCVandegrift about Amazing Slow Downer, v5.5.4