
iTunes:
Modular Synthesizer - Pulse Code, Inc.
"TAKE YOUR MUSIC TO THE NEXT LEVEL
Modular, the ultimate synthesizer that will revolutionize your sound.
• High fidelity virtual analog synthesis using band limited oscillators and oversampled filters
• Audiobus and background audio modes
• CoreMIDI control with external devices or internal sequencers
• Beautifully rendered graphics
• Dynamic workspace with intuitive navigation
• 10 octave keyboard with classically styled arpeggiator
• Extensive in app help with detailed module descriptions and guides
• Record and export live performance to Soundcloud, Sonoma Audio Copy, email and iTunes file sharing

Modular looks, acts, and sounds like a hardware modular synthesizer to give you features that musicians want such as pulse width modulation, oscillator sync, 4 pole ladder filters, and 1v/oct filter tracking. Traditional modular systems are expensive and out of reach for the average artist. Modular is here to bridge that gap and allow everyone the opportunity to use these powerful synthesizers.
Modular provides modules in every category for free. Enough to build a vast array of sounds. Buy only the modules you need or get the bundle which includes all modules including future modules. Owning a module means you use as many as can fit in the modular rack. You want to build a monster 6 oscillator synth? You can.

Every detail of the audio has been analyzed to provide you the most amazing sound possible such as buttery smooth filter sweeps and resonance so stable you can use the filter as an oscillator!
Modular goes a step further with connectivity and supports Audiobus, Soundcloud, CoreMIDI, as well as Sonoma Audio Copy so that your music making workflow is streamlined and integrated."
iTunes:
Modular Synthesizer - Pulse Code, Inc.
1st user video further below.
Modular Synthesizer para iPad/iPhone: conceitos básicos (MusicApps.com.br)
Published on Sep 11, 2013 Marcus Padrini·192 videos
The video is in Portuguese, however it will give you an idea of the interface if you do not speak the language. Audio starts at 11:14.
Update: I originally stated this was the first user video. It actually wasn't. I believe the first was by discchord posted here.