That iOS app, Cube Jam, allows you to record and play along with tunes from your iDevice and connects via the i-Cube Link stereo auxiliary input from the headphone jack of a slate or handset.
The left side of the slate houses a headphone jack, micro-HDMI connection, micro-USB 2.0 and a full-size SD card slot that lets you add up to 128GB of external storage (and theoretically more).
Detach the tablet from the dock, and you'll find the slate includes a microSD card slot, a 3.5mm headphone jack and a docking port that connects to the keyboard or the charging cable.