I just bought this for my iPad 4. It sounds great, but some of the lead presets have a nasty underlying "growly" distortion when I play the keys. It happens both with and without headphones plugged in.
One example, C_Duncan_factory/Leads/CD_Glider1
It sounds like some modulation is on, but there isn't. This rumbling/growling has a specific pitch, it's like an extra oscillator making a rumbling sound. I've enabled VCO3 and tuned that, it wasn't that one either. It's not some modulation affecting the filter either. It really sounds like a sound that isn't supposed to be there.
Anyone else experience this? Sounds like a bad bug to me..
I know well how to operate subtractive synths, having several hardware synths, but I can't find the culprit here, and specially since it's only in some presets but not in others.
Having messed about more with the mentioned preset, I found that the EXT.INPUT VOLUME button is active and creating the growl. I thought that was supposed to provide some nice warm feedback distortion, not mess up the preset completely unless you turn it off, though.