It's one of their super-tiny omicron series.
Here's a demo I found (my money is this was done by a TBer).
The Malekko site says it's based off of a classic filter -- the only classic two-knob filters I can think of are the DOD FX25 and 440. It sounds too subtle to be an FX25, but I've been wrong before. Any ideas? Anyone try it and compare to other filters?
Moar info plz.