[iPhone God App] It was found using the XENON Groove Synthesizer actually

XENON Groove Synthesizer is a music making app with polyphonic hybrid synthesizer, 2 VA monophonic synthesizers, polyphonic PCM synthesizer, rhythm machine, sequencer, mixer and also includes over 350 preset sounds.

* Audiobus support (v1.7.0)
Now you can stream live audio directly to other Audiobus-compatible apps! See http://audiob.us for more information.

* Hybrid Polyphonic Synthesizer
(VA, FM, Formant, PCM(112))
2OSC + FILTER + AMP + 4LFO + 8ENV
- 210 factory presets

* Virtual Analog Monophonic Synthesizer x2
2OSC + FILTER + AMP + 3LFO + 6ENV
- 45 factory presets

* PCM Polyphonic Synthesizer
OSC (112 PCM sounds) + FILTER + AMP + 3LFO + 6ENV
- 108 factory presets

* Rhythm Machine for six tracks
- 185 PCM rhythm sounds

* Mixer
Level, PAN, Send, Solo, Mute

* Pattern Sequencer
- 16 step Pattern Sequencer
- Real-Time Recording

* Song Sequencer (320bars)

* AudioBus
* CoreMIDI (input)
* Export
- Export as WAV file
- Export to clipboard (compatible with Intua Beatmaker, GarageBand)

Further information at http://ios.icegear.net/xenon/