Look at them as four groups with three rows of eight buttons in each group.
In each group, the bottom row of buttons shows note events. The middle row shows accents. The top row shows slides. Notes, accents, and slides for each step can be turned on and off by pressing the corresponding Matrix button.
What are accents?
An accented step plays at maximum velocity. An unaccented step plays at the velocity at which it was recorded.
What are slides?
With a slide active, that step will pitch-bend up to its note value. The time this takes is determined by the Glide knob.
Because holding a note in the lower zone of the keyboard can transpose the sequence so you can solo over it in the upper zone. You can set the split point by holding the Timbrality button and pressing a key on the keyboard. The sequence will now play in any key you hold in the lower zone.
This is a powerful hybrid of the Sequencer and Arpeggiator, generating patterns of up to 16 steps. While in the Sequencer view, press Seq and Arp together to enter it.
The Matrix buttons now show the following:
Rows A, B, and C are slides, accents, and note events, respectively, just like in the Sequencer.
Rows D-I show up to six notes for each step. D is the highest and I the lowest.
Rows J, K, and L act as octave shift buttons across a three-octave range.
Each step in the pattern can be polyphonic, with the overall six notes determined by the chord you hold and the notes per step set by the blue buttons. In the GIF above, step 1 is playing a full six-note chord; steps 2, 3, 4, 7, and 8 are playing two-note intervals in that chord, and steps 5 and 6 are playing single notes.
Note: The number of active steps in a Matrix arpeggio is set by the Seq Length button. Hold it and press the final step desired in row C.