The user interface is rather big, but then again, there are a lot of knobs on it. The interface is made up of two major sections. The top section that has the master controls and all the sound settings that act on the current selected pad. The lower part consists of sixteen pads that can contain one drum sample each. There are also volume and panning controls on each pad and a big button that you can use to audition the sounds. The buttons even move when you play back your drum pattern so you can see which sound plays when. The knobs are moved by a vertical movement of the mouse (my preferred way). They also have the little pop-up function that shows an exact value when you move a control. All very familiar when you have seen a Muon synth, but also very useful.
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