They will almost certainly support method 2. Pragmatically, you should do this with Reaper or whatever other tool you are using. If your a programmer and are interested, I am reading a book by Craig Lindley that includes some easy computational algorithms in java that are open source and I could send to you. It is not immediately obvious how to do this computationally and involves some linear algebra. The idea here is to change the tempo without altering pitch. Fine to jam and practice with and at a reasonable pace for a student. This resulted in the same sound pitched almost an octave below the original. Old jazzers and some guitar players would play a record at half speed in order to slow down fast passages and play along. Another way to think of it is turning up the speed of a turn table. If you kept all 44100 samples but changed timing so that that all played over a half a second, you would be compressing the wave.
Imagine a given file of audio data is 44100 samples long and this took 1 second to play. This can be done with many tools (probably all tools you would call a daw) including Reaper.Ĭompressing the wave. You are talking about changing the tempo of a track.