I know this is subjective, and Steve Duda is highly skeptical of people criticizing its "warmth" based on unquantifiable data...but it's just my opinion.)
I'm with him on thisone.

...it usually means the filter does something extra like saturation. His goal was to make ultra clean synth. This might be a biproduct of it. Those filters are AFAIK Andrew Simper's ones. He made the Glue and The Drop. I think he knows his way around a filter.
Back to topic:
I have kinda lot of ideas about new plugins. I even forced myself to learn a bit of Reaktor so I could try to patch few of them right away. (Caution, it EEEAAATTTSSS time.) Here's my life plan: Where i'm like 40, after a mid-life crysis and all that stuff, I'll dive into DSP programming!

One idea I think about a lot is to make a convolution synth. It would have just a simple (may be just sine?) OSC, and you'd generate harmonics by thowing it through one or more impulse responses from provided library. Those IR's would be wierd. Recorded by running impulse through wierd unusuall stuff. Like a guitar body, or metal tube, or surface of a table, a string ... you get the idea. (If some DSP programmer sees this, go ahead, make it. I want to use it ASAP.

...and let me know so i can watch it beaing made!

)