Up to 16 independent simultaneous messages can be sent over one MIDI cable on different MIDI CHANNELS. This means that one sequencer can send independent sequences to up to 16 independent sound modules at the same time. For example, a DRUM MACHINE (a module which plays drum sounds) could be assigned to MIDI CHANNEL 1, a synth bass sound module could be assigned to MIDI CHANNEL 2, and a synth piano could be assigned to MIDI CHANNEL 3. The sequencer could then store a piano, bass and drum composition, and send the data for this composition OUT through one MIDI