Prolific developer DesignByPaul has released PolySynth. This polyphonic synthesizer features "analog character" and a whole bunch of features including Audiobus 3, Inter-App Audio, and MIDI Input.
PolySynth iTunes Description:PolySynth is the first true polyphonic synthesizer from DesignByPaul with only 3 note polyphony but packed with vintage analog character. Everything on one screen makes sound design quick and easy including fine tuning of each note in the scale for endless microtuning possibilities.
PolySynth filter section sports and ms20 style resonant highpass and 24db/oct resonant lowpass.
PolySynth has Audiobus 3 support, IAA (Inter-App Audio) and MIDI-In so you can connect, play and record with other apps.
— Microtonal tuning
— 3 note polyphony
— MIDI note in
— 24db/Oct MS20 Lowpass filter and resonant highpass
— Inter App Audio
— 3x oscillators
— 2x LFOs
— 2x ADSR envelopes