SynthTronica for iPad
SynthTronica is a unique, spectral synthesizer for the iPad. It comes with 90+ presets (including vocal/vocoder effects) and the ability to create your own. It’s formant synthesis allows the filters to use time-varying formants that can be edited and viewed in spectral form.
Sunrizer for iPad
Sunrizer is a virtual analogue synthesizer for the iPad. Its beautiful GUI and excellent sound quality make this app one of the best iOS synthesizers available. With 2 oscillators per voice, 2 independent filters per voice, and selectable waveforms (PWM, SuperSaw, Saw, FM, Triangle), it is easy to create some very interesting sounds.