Avacata’s OddTunes: Hang (App Store link) is a $.99 virtual Hang drum for the iPhone.
If you’re not familiar with the Hang drum, it’s steel percussion instrument, similar in sound to a steel drum, that is typically played using the hands and fingers while it rests in the musician’s lap. It was developed in Switzerland in 2000 by Felix Rohner and Sabina Schärer. There are currently 5 generation models.
OddTunes: Hang is styled after a first generation Hang drum, in Aeolian tuning with a D3 central note and a A3 C4 D4 E4 F4 G4 A4 tone loop. The eight notes are arranged in a ‘Tone Circle’ that zig-zag from low to high and are harmonically tuned around the low ‘Ding’ note in the center.
OddTunes:Hang adds some interesting features, beyond just replaying samples, including looping, roughly modelled after the Gibson / Oberheim Echoplex Digital Pro.