if anybody from eMastered reads this thread, it's friggin' 2019 and this is not a product.

Here are most of the things you need to implement to have this plugin not suck in one convenient list:

A comprehensive manual, not a weak help section, that installs on the user's computer.
Brighten your damn interface.
Actual analog-modeled filters. Smooth out the zippering, fix the aliasing.
Have a modulation matrix with at least two slots.
Add modulation sources: the pitch and mod wheels, MIDI CC, et cetera.
Analog-modeled oscillators. Think about it.
A pulse-width knob, and PWM. You can't just have a square wave.
Add some oversampled oscillator sync. Consider adding oversampled FM and ring modulation.
Unison phase randomness control. No more pssshew.
Key-tracking, resonance, and drive on the oscillator filters.
Make it abundantly clear that you're supposed to modulate osc filters for normal poly sounds.
That probably means a complete reprogram of the presets.
Modulation system: either make it drag-and-drop like it says on your website, or don't claim it is.
Same with AI. Either implement it so it's noticeable, and provide documentation, or nix it.
Actually, I lied. just get rid of ALL your marketing copy. Start again when you've got a good synth.

And finally:
Release this for free because even when you've implemented all these things, it still won't be on par with Synth1.