Nice & Simple
This app does what I need it to do with ease. Works great! My primary use for this app is to change songs from their original keys into whatever key my group is doing them in. This makes it easy to work out guitar parts in the new key. Sometimes I slow down the tempo for more difficult passages and it always tracks well with little to no artifacts. Also, If I’m learning a bass part that’s buried in the mix, I’ll raise the pitch by an octave which makes the bass notes much easier to hear.
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iRehearse