Akai MPC 5000 Quick Start Manual page 14

This will add audio tracks to the current song, and the screen will be displayed as
shown on the right.
For our example, let's choose 'ANALOG'.
For our example, let's select tracks 1 and 2.
Adjust the [REC GAIN] knob to get the best volume level without clipping or distortion.
This will start the recording process.
Press the [STOP] button to end the recording when you are finished.