Here is how to change the Midi channel on the TB-3
1. While holding down the [SCATTER] button, turn on the power.
The display indicates the current MIDI channel (e.g., C 2 = Midi channel 2), and the [Play/Stop] button blinks. If you decide not to make settings, turn off the power.
2. Use the [VALUE] knob and the pad to change the settings.
MIDI Channel [VALUE] knob
OFF, C 1 – C16 Specifies the MIDI transmit/receive channel.
The display indicates the channel. (default: C 2) ONn (OMNI) MIDI messages of all channels are received. The MIDI transmit channel will be 2.