Akai MPC Reference Manual page 131

TRACK MIXER MODE REDESIGN
We redesigned some features of Track Mixer
Mode window.
Showing/hiding channel strips: You can now
show or hide (1) unused Tracks' channel strips
(those with no note events) and (2) plugins through
which your tracks are routed.
To show or hide unused Tracks' channel strips,
click the + icon to the left of the channel strips or in
the upper left corner of the grid.
To show or hide plugin channel strips, click the
plug icon to the left of the channel strips or in the
upper left corner of the grid.
For more information about how to route tracks to
plugins, see the Plugin Architecture Redesign
section earlier in this addendum.
On each channel strip and in the grid above, an icon will indicate
whether the Track is using a Drum Program, Keygroup Program,
MIDI Program, or Plugin Program.
Track Mixer Mode with unused Tracks
hidden and Plugin Programs shown.
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Drum Program
Keygroup Program
MIDI Program
Plugin Program