Alesis QuadraSynth, Reference Manual

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Connections
QuadraSynth Reference Manual 25
If you have a master controller or QuadraSynth which can send on multiple MIDI
channels, you may want to set ÒMix Group ChannelÓ to off. To create layers or
stacks, your controller must send multiple MIDI messages to the S4 simultaneously.
This offers you the added control of changing the sound from the controller by
sending Program Change commands on individual channels within a mix. A
disadvantage of this approach is that the controller must send many channels of
duplicate MIDI messages simultaneously.
Note that in Program mode, the Mix Group Channel parameter has no effect.
Typical Application 2: Using the
QuadraSynth with an External Sequencer
The QuadraSynth can generate MIDI signals that are recorded by a sequencer. On
playback, the sequencer sends this data back into the QuadraSynth, which then
serves as a multitimbral sound module (Mix mode). The sequencer can generate data
over several channels; in Mix mode, the QuadraSynth can be programmed so that
individual Programs play sequenced data on specific channels.
Example: If the sequencer transmits a piano part over channel 1, a bass part over
channel 2, and a drum part over channel 10, you could set up a QuadraSynth Mix so
that a piano sound plays only the MIDI data assigned to channel 1, a bass sound
plays only the MIDI data assigned to channel 2, and drums play only the MIDI data
assigned to channel 10. The QuadraSynth can store up to 100 User Mixes.
Connect the sequencerÕs MIDI Out to the QuadraSynthÕs MIDI IN, and the
QuadraSynthÕs MIDI OUT to the sequencerÕs MIDI In. This allows the QuadraSynth
to send data to the sequencer for recording, and play back data from the sequencer.