Akai MPC 5000 Reference Manual page 83

„
The TRKMIX page will be displayed.
Each column indicates track 1 though 8 from the left and the currently selected track is highlighted.
The column for the selected track will now be highlighted.
Track will play as normal
Track is muted
Additionally, if this field is scrolled while the [SHIFT] button is held down, the following is available:
Track is soloed.
„
If you set this field to YES and change the LEVEL, SEND, MUTE, or PAN in the
TRKMIX page while recording in SONG mode, the changed data will be recorded
into the song. The song will be played with changing the Level or the Pan as you did
during the recording. The mix data recorded in the song is displayed in STEP EDIT
page as follows and you can edit it the same as other MIDI event.