Akai MPC User Manual page 58

In the software, click the Program Edit tab. With the Sample drop-down menus for Layer 2 to Layer 4,
you can assign up to four samples (loaded into the Project Information beforehand) to create velocity
layers or make other layer-dependent adjustments.
Hardware: Press the Prog Edit button. Press F2 (Samples). With the Q9, Q5, and Q1 Q-Link Knobs,
you can load additional samples to your existing one. These samples are placed in up to four Layers.
To create complex Keygroup Programs, you can add more Keygroups (up to 128). This is useful when
working with multi-samples (e.g., when programming a real piano).
Remember: A Keygroup Program offers up to 128 Keygroups, and each Keygroup can hold up to four
samples (Layers 1 to 4). This is a total of 512 samples.
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