Yonac Software has introduce an iPhone synthesizer, miniSynth. 

miniSynth is a vintage-modeling keyboard synth for the iPhone platform, featuring dual oscillators, adjustable retro-style sound filter, attack/decay, glide and a tape-delay influenced delay unit. 

Features:

• Two variable-range, “old school” oscillators
• Four individual waveforms per oscillator (triangular, sawtooth, sine and square)
• Six stops per oscillator, giving approximately a 5-7000 Hz range, including individual LFO switches
• Dedicated VFO mixers
• User-controllable VCF (variable capacitance filter), with retro-modeling algorithm and feedback
• User-controllable attack/decay filters
• Programmable glide
• Vintage modeling “tape delay” reverb unit, including adjustable delay time and decay
• Keyboard-on mode
• 48-key, 4-octave keyboard
• 10 factory sound presets