This topic describes how you can play along, or 'jam', with Composer 's playback of a song, if you have a MIDI keyboard or controller. Composer will route your MIDI performance to a MIDI output device and channel that you specify and it will use an instrument sound (MIDI patch) that you specify. If you have a MIDI keyboard or other MIDI controller such as a MIDI guitar, then you can play along while Composer plays the song.
