Using The S4 In Live Performance - Alesis S4 Plus Reference Manual

64 voice sound module
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Chapter 3: Connections

Using the S4 in Live Performance

Depending on the capabilities of your MIDI controller keyboard, you have two
different options available for how the S4 Plus will respond when it is in Mix Play
Mode:
If your controller can only issue commands on one or two MIDI channels
simultaneously, you may want to set the S4 Plus' "Mix Group Channel"
parameter (on page 2 of the Global display) to a channel between 1 and 16, so
that your controller can play a mix of several S4 Plus Programs in response to a
single channel of MIDI.
If you have a master controller or QuadraSynth which can send on multiple MIDI
channels, you may want to set the S4 Plus' "Mix Group Channel" to "Off". To
create layers or stacks, your controller must send multiple MIDI messages to the
S4 Plus 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: In Program Play Mode, the Mix Group Channel parameter has no effect. For
more information about the Mix Group Channel parameter, see pages 41, 44 and
112.
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S4 Plus Reference Manual

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