I'm pretty sure one of these is a typo, but Amen Break and Bleep developer Alkex has released a series of new $1 apps that are varyingly titled Finder Drum Pads and Finger Drum Pads. Each app features a specific sample set, with both MIDI In and Out.
Finder/Finger Drum Pads iTunes Description:
Transform your phone into a ________ drum machine!
Play the kit's pads and enjoy the sound of the legendary analog drum machine, or modify it to the max in real time with the multiple effects!
- 8 Pads, and an assignable ribbon controller.
- 3 Audio effects:
• Pitch Bend, Low Pass Filter, Bit Crusher.
• Effects can be assigned to Ribbon Controller and both axis of the device's Accelerometer.
- Midi IN: trigger the sounds externally
- Midi OUT: control other synths with FDP's pads!