This explains how to map a midi keyboard to play songs and loops like a synth. Values for each key : .000 .083 .167 .250 .333 .417 .5 .583 .667 .750 .833 .917 mapping inspired by LasVegasOle's video www.youtube.com Also good for just changing the song key easily and accurately! "Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use."