ANATOMY OF AN EXPRESSION CONNECTION
NOTE: This is explicitly for Ramble FX pedals, but it is also the most common configuration for other pedals. Check the manufacturer's specification first.
Kismet’s expression input is a ¼” TRS, or stereo jack. TRS stands for TIP, RING, SLEEVE, and describes the three connections of the plug. Kismet sends a constant 5 volts out through the RING connection and measures the voltage that returns on the TIP connection. That voltage is corresponds to the expression pedal's position.
Constant 5 volts is supplied by Kismet (or other pedal)
A voltage is returned (0-5V) that corresponds to the expression pedal's position.
DO NOT inset a TS mono connector into the expression jack
Expression input is for PASSIVE devices only. All devices NOT powered, like most volume and expression pedals, are passive. If it requires a power connection for gain, buffer, etc., it is NOT compatible. A specific exception is a pedal that uses power only to vary internal resistances via an opto-coupler and has an entirely passive signal path (some Morley pedals). For control voltage (CV) device instructions, go HERE
CONNECTING A VOLUME PEDAL FOR EXPRESSION CONTROL
A volume pedal is a foot-controlled potentiometer with separate input and output connections. A voltage enters one jack and a fraction of that voltage is sent out the other jack. It usually has a logarithmic (audio) curve, or sweep. Most volume pedals can be used as an expression controller, but a special cable, such as the HOSA STP-203, is required.
INTO KISMET'S (or other compatible pedal) EXPRESSION INPUT
STEREO -to- DUAL MONO CABLE
HOSA STP-203 or similar
CONNECTING AN EXPRESSION PEDAL
An expression pedal is a foot-controlled potentiometer with only one stereo jack. A single cable contains both the input and the output wires. A fixed voltage enters on one wire, and a fraction of that voltage is sent back on a separate wire. The taper, or sweep of most expression pedals is linear. Most expression pedals can be used with Kismet.
REQUIRED: TIP-to-WIPER POLARITY
REQUIRED CONNECTION POLARITY: Tip-to-wiper. This is probably the most common, but not all pedals use this polarity. Expression pedals with the wrong polarity can be made compatible with a polarity-reversing adapter, available at here.
COMMON EXPRESSION PEDALS
This is a chart of the polarity and sweep of some common expression pedals. All are directly compatible with Kismet except for the Zoom FP02M, which requires the "1/4" Stereo Polarity Changing Adapter," available from Ramble FX, and shown above. Kismet's "Expression Sweep" toggle switch should be set to match the "SWEEP (taper)" of the expression pedal.
Dunlop DVP4 Mini/DVP3
NOTE: Line 6 pedals that use a TS, mono cable are not compatible.
Correct with switch set to 'OTHER'
Wrong. Correct if used with “Polarity reversing adapter” (buy at www.ramblefx.com)
Correct with switch set to TIP
Correct with TRE +/- Button 'out'
Correct with switch set to ‘M-Audio’
Log (audio) - must have knob turned all up
Linear - set minimum knob to fully counter clockwise
Linear - set range to '10'