Applies to: Launchkey MK1, MK2, and MK3
You cannot use an expression pedal with a Launchkey MK2, MK2 or MK3.
All Launchkey keyboards have a 1/4" sustain pedal input on the rear panel of the unit. This port is meant to be used specifically with a sustain pedal, not an expression pedal. If you connect an expression pedal here, you will notice that the pedal will send a sustain message at full maximum or minimum value.
If you're having problems with a sustain pedal and the Launchkey, try powering on the Launchkey with the sustain pedal connected and pressed down. Also, check the pedal for a polarity switch and try switching this.
If you want to use an expression pedal to send MIDI commands to your DAW, or to external MIDI devices, we recommend looking into the SL MKIII range.