Studio One and Reaper both have the
time stretching feature that I would dearly love to have in "Mengwalk." It used to be called VariSpeed on the old tape machines and nowadays has two very useful main options:
1) to affect
both the tempo and pitch (e.g. Record while hearing the previously recorded material 50% slower, and play back at the original speed with the resulting pitch of the newly recorded track sounding an octave higher than recorded (in this example). Less drastic speed reduction (or increase) results in a smaller pitch difference (and fewer artifacts).
Otherwise known as the "chipmunk effect" or the "Les Paul fast, high guitar trick", this is handy not only for playing fast, technical material (especially on an instrument you don't play every day), but for singing notes slightly out of your range (either too high or too low), or for playing a piece with the fingering and in the key that fits your instrument and have it match the pitch of the recorded material. For example, if a recorded rock song is in F# (must be some prima donna singer again!), you can temporarily change the recorded pitch, play along in the more natural rock key of E or A on the guitar while recording, and then hear everything play back in F#).
2) to affect the
tempo but not the pitch (e.g. Record while hearing the previously recorded material a specified percentage slower but still at its original pitch, and play back at the original tempo. The pitch of the newly recorded track sounds as recorded. Handy for playing material that's tricky at the original speed, but not change the resulting pitch in any way).
3) it's a whole lot of
fun, and that's worth an awful lot because it seems kind of rare these days :)
So, I'd be willing to pay ..... so much I'd be ashamed to tell anyone.