Akai Professional MFC KEY 51 Guide D'utilisation Rapide page 10

Operation
Using the Display
Here is some general information about how to use the MPC Key 61 display:
Tap a button or option to select it. Use the data
dial or –/+ buttons to change its setting or
value
Spread two fingers to zoom in (into a section of
a waveform, for example). Pinch two fingers to
zoom out.
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Double-tap a button to access advanced
editing options. In some cases, this will show a
numeric keypad that you can use to enter a
value (an alternative to the data dial or –/+
buttons). Tap the upper-left part of the display
to return to the previous view.
The upper edge of the display shows the
toolbar, which contains information about the
current view (often the name of the current
track, sequence, audio pointer position, etc.).
Tap an item to select it.
The lower edge of the display shows various
buttons that you can use in the current view.
Tap a button to press it.
To return to a previous view, either tap outside
of the window currently in the display or tap the
left arrow () in the upper-left part of the
display.