Bouncing Tracks

Bouncing tracks generally refers to combining two or more audio tracks down to one mono or two stereo tracks in order to free up tracks for use in multi-track recording.

For example, if a musician records instruments to an eight track recorder and finds that more tracks are needed for his/her recording, he/she could mix (combine) two or more of the previously recorded tracks together and "bounce" them to a free track, thus freeing up the tracks containing the original, unmixed audio for more recording.