Akai MPC TOUCH User Manual page 217

Master
In the Master section, you can set the playback mode and tuning for the
overall program as well as the number of total key groups.
Number of KG (keygroups) lets you create up to 128 keygroups within a
keygroup program. This is very useful when working with multi-samples. For example, if you want to
create a realistic piano, you can use different keygroups (e.g., 88 for a grand piano) with every keygroup
containing its own sampled note (with up to 4 possible velocity layers).
Use KG Select in the Key Group section to edit a keygroup—or all keygroups simultaneously.
The Polyphony drop-down menu sets the playback mode for the program. When set to Mono, only one
pad will sound at a time. If a pad is played while another (or the same one) is still playing its sample(s),
the new pad will immediately mute all other currently playing pads in that program. When set to Poly,
several pads can be triggered at the same time, limited only by the total number of voices available.
Semi lets you transpose the selected program up to 12 semitones up or down.
Fine provides fine-tuning of the program by fractions of a semitone up or down.
Trans transposes incoming notes; it does not change the pitch of a sample.
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