Nice work! You should tune the control sensitivities though, like with the filter cutoffs the usable range is concentrated in a few pixels on the left.
I guess synths usually use some kind of logarithmic scales?
Good observation! You're absolutely right. I need to make a few of the sliders non-linear/logarithmic. I wouldn't want to simply decrease the range of the lowpass filter for example and lose the subtle higher frequencies. Thanks for the input.