bleep!BOX (iOS) app for $4.99

bleep!BOX has NO SAMPLES - every sound is generated in realtime, so you can tweak to your hearts' content and kiss repetitive, cookie cutter drum beats and loops goodbye. bleep!BOX is not a simple toy - it's powerful enough for you to make real music. Great for house, hip hop, R&B, electronica, drum’n’bass, trance, techno, IDM and more.