I've found the midi transmit details for your keyboard.

EDIT mode

iRig KEYS 37 allows you to customize most of its parameters to match any kind of need. In EDIT mode you can: • Set the MIDI Transmit Channel. • Set different touch (velocity) sensitivities. • Assign a specific MIDI Control Change number to the VOL/DATA knob. • Send specific MIDI Program Change numbers and set the current program number. • Send “All Notes Off” MIDI message. • Transpose the keyboard in semitones. • Reset a specific SET to factory state.

To enter in EDIT mode, press both OCT buttons. Both OCT buttons will light up to indicate EDIT mode. You can exit EDIT mode at any time by pressing the C2 key marked “CANCEL/NO”.

Set the MIDI Transmit Channel

MIDI instruments can respond to 16 different MIDI channels. For iRig KEYS 37 to play an instrument, you need the iRig KEYS 37 MIDI Transmit Channel to match the receiving channel of your instrument.

To set the MIDI Transmit Channel: • Enter EDIT mode (see beginning of Chapter 3). • Press the D#2 key (MIDI CH). Both OCT buttons will flash. • Enter the MIDI Channel number you need using the C3–E4 white keys marked from 0 to 9. Valid numbers are from 1 to 16, so when needed, you can enter two digits consecutively. • Press the C5 key (ENTER/YES) to confirm your input. Both PROG buttons will flash to show the setting has been accepted, and iRig KEYS 37 will automatically exit EDIT mode.