1.
Select the software you want to use. It is best to use a program that allows you to slow down music without changing the pitch. Renegade Minds and Amazing Slow Downer are two choices. Audacity, available for PC and Mac, is a free option. More expensive audio recording programs such as Pro Tools will also work. There are several options available. (See Resources.)
2.
Burn songs you want to slow down and learn on your computer. Media Player to burn tracks from your CDs to your computer’s hard drive or Burn OS X if you have a Mac. Both programs are free and easy to use. Insert the CD with the tracks you want to burn, go to the ‘Burn’ menu and select the tracks on the disc you want to transfer to your computer.
3.
Open the audio program and select ‘Open’ in the ‘File’ menu. Browse to the location on your computer where the music track you want to open is located. Click on the file to open it. The song file opens for editing in your software. For Audacity you only need to Do to adjust the speed of the song, use the slider in the toolbar to increase or decrease the speed. Half speed is a good place to start to learn fast passages. Amazing Slower Downer also works with a slider. Both programs have loop options so you can play a slower passage repeatedly until you learn it.
Slowing down recorded music is a way that many musicians who learn to play songs by ear choose to listen to particularly fast musical passages to capture phrasing and notes. When a song is played at slower speeds, you can often hear musical phrases that are usually missed when played at normal speed. This is especially true of guitar solos, where some notes are played so fast they are almost inseparable. Slowing down a song so that you can hear these phrases is easy to do and can help you play songs with more accuracy.
Source:danspela.com