This is my favorite of the dedicated groove apps. With CoreMIDI clock and a mind boggling assortment of per-part effects and modulations, Molten out Electribes the Electribes. I also really like the easy way it handles patterns and note lengths. The CoreMIDI lets this play with other Apps as well as any external sequencers. With AudioPaste it is also the best option for getting your own sounds into a groove app. Consider getting Hokusai to refine your samples as well as import from PasteBoard sources. Some people prefer FunkBox, but I think this blows it away.