Tim at Discchord called this ‘ugly’. I’m not sure it’s that bad, although it could do with a better description, or at the very least a bit fuller anyway.
Here’s what the developer says about DA ONE Synth:
The DA ONE synthesizer app provides you with a powerful synthesis engine combining digital and (virtual) analog synthesis methods, such as wavetable synthesis, vector waveform mixing, subtractive, additive, and frequency modulation synthesis. The individual blocks of this synthesizer are connected using an innovative and highly flexible routing system that allows millions of different configurations of oscillators, filters, and distortion blocks.
DA ONE Synth costs $7.99 on the app store now: