The SPT-667 Phrase Trainer makes learning riffs by ear really simple. Say you want to copy a guitar solo. The Phrase Trainer lets you load song (WAV, MP3, WMA etc...) slow down the playback speed to as little as 50% (or double-speed) of the original without changing its pitch, and loop the playback to repeat the phrase over and over until you get it! Or, when you mastered lick you are working on, you can change pitch of the song and practise.
||Free to try