I've been looking at the Tascam Bass Trainer. The music I play in my band is originally recorded either tuned down a full step, half step or in standard tuning. Plus, for my church gig, they constantly change keys, going from say a D tuning on the CD to playing in A. Since I like to practice along to the CD, can the Bass trainer handle all this? And does it sound any different? ie. slower or faster because of the key changes? Back in the 80's I remember there used to be a tape recorder that you could slow down to figure out guitar solos. But, then the solo would be an octave lower. But this thing seems WAY better. So, does it really do all that I'd want it to do?