Source Audio C4 Synth User Manual page 17

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Although the CONTROL INPUT port expects a 4-contact TRRS plug, it is still possible to use a 3 party
expression pedal with a 3-contact TRS plug (Note: you should make sure the expression pedal's TRS
configuration is the same as the graphic below). Use a 3-contact 1/4" to 1/8" (3.5mm) TRS plug
converter - the expression pedal's output will be connected to the C4's X-axis. For proper operation,
the configuration steps in the next section must be followed when using any expression pedal,
whether from a third party or from Source Audio.
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Expr ession
Expression pedals with TS (Tip Sleeve) plugs will not work correctly with the C4.
The resistance/impedance of the expression pedal does not matter. The C4 will automatically adjust
itself to the range of the expression pedal when it is configured.
Configuring the Expression Pedal
Use the C4 Synth's Neuro Sound Editor to assign expression control to up to three parameters.
Expression editing is accomplished in the External Control block of the Neuro Sound Editor. For more
info on assigning expression control to the C4 go to the External Control section of this manual.
Hot Hand 3 Universal Wireless Controller
The Hot Hand 3 Wireless Effects Controller connects directly to the C4's Control Input with a 1/8"
TRRS cable and can be used to control up to three parameters. Hot Hand 3 works similarly to an
expression pedal, but rather than rocking an expression treadle to move parameters, Hot Hand
moves parameters with hand motions via its wireless ring. Visit the Hot Hand 3 Page on the Source
Audio website for more details on HH. The Hot Hand has two axes of expression: X and Y. These
signals are carried on the two rings of the TRRS cable that comes from the Hot Hand receiver.
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Y Exp X Exp
SA249 C4 Synth User Guide 17