I just watched a documentary about Frank Zappa. One of his children said that there was no way to slow down or speed up playback of digital audio in the way analogue tape can. Of course, this is wrong. Although a audio workstation software tends to limit the sample rate to a fixed value, eg. 44100hz for 'CD quality' or 48000hz, 96k etc., you can often set the playback speed in sample editors, like SoundForge, to slowdown or speed up a sample. I thought I'd draw up a frequency table of playback speeds to retune a wave.
Sample playback speeds to retune a wave, with frequencies based on 44100hz. Ratio formula = pow(2, note/12).
Note Ratio Freq -12 0.5 22050 -11 0.5297 23361 -10 0.5612 24750 -9 0.5946 26222 -8 0.6300 27781 -7 0.6674 29433 -6 0.7071 31183 -5 0.7491 33038 -4 0.7937 35002 -3 0.8409 37083 -2 0.8909 39289 -1 0.9439 41625 0 1 44100 +1 1.0595 46722 +2 1.1225 49501 +3 1.1892 52444 +4 1.2599 55563 +5 1.3348 58866 +6 1.4142 62367 +7 1.4983 66075 +8 1.5874 70004 +9 1.6818 74167 +10 1.7818 78577 +11 1.8877 83250 +12 2 88200
