Fast answer

Save the data before powering off. Akai’s Quick Start Guide states that entered data and audio are deleted at shutdown unless saved.

Do this first

  1. Before power-off, go to the MPC500 save/load workflow.
  2. Save the current work to the intended storage destination.
  3. Confirm the saved file is present before shutting down when the work matters.

Diagnose it

Was the session explicitly saved before power-off?

Yes: Check that you loaded the intended storage location and project on restart.

No: The MPC500 does not retain entered data and audio after shutdown unless it has been saved.

Expected result

The saved work is available to load after the MPC500 restarts.

Why this works

The official quick-start guide expressly warns that data and audio are deleted at power-off unless saved.

Still stuck?

Recheck the physical MIDI direction and the exact source device setting. If this behavior differs on your hardware, keep the model/revision and setup details for a correction report.

All MPC500 fixes
Provenance

Sources & review

Last desk review: . Documentation does not replace a physical hardware test.

Sections reviewed: Quick Start Guide p. 9.