The bottom-left 4 x 4 pads represent drum sounds (touch the slider to scroll up and down through even more sounds), while the bottom-right quarter of the grid serves as a clip-length control (press and hold the first pad, tap the fourth for a four-bar loop, etc.).
Push lets you add drum hits by tapping the pads on and off as the loop plays, but you can also record a pattern in live if you're a bit of a finger-drummer.
The influences of Air and Godrich are easy to distinguish in "The Operation, " which adds a metronomic drive of analog drum machine to the simmer of synth pads and intertwining guitar and piano.
The remaining 8 x 4 pads above now function as a step-sequencer -- with a sound selected, tapping these adds drum hits in the respective position in the drum loop.