On the MPC X and MPC X SE, multiple audio outputs are available for connecting to monitors, mixers, and other external equipment.
It’s important to note that the additional outputs (channels 3 - 8) operate at a fixed level of 0 dB and are not affected by the main volume knob.
As a result, if the main volume knob is set below maximum, the main outputs may sound quieter than outputs 3 - 8.
To match the output levels, simply increase the main volume knob until it aligns with the level of the additional outputs.