Perhaps the Modcan suffers from the lack of compensation in the filter. When resonance is increased, the frequency at the "knee" is amplified (I will continue to use a "leg" metaphor for this description, with the passed frequencies being the "thigh top" and the roll-off being the "shin"). In a filter not designed to compensate for this phenomena, the "thigh top" frequencies will all be decreased in amplitude (volume) and the slope of the filter "shin" will become steeper. This is perhaps the situation with the ModCan, with the bass frequencies losing "punch" when the resonance is increased.
This compensation needs to be specifically designed into the circuit and adds expense to the cost of production. Although I am not certain, I believe the Serge VCFQ has this compensation built in.
Scott
"C. Whitten" wrote:
The ModCan has a very rich bottom end and a zingy high end but all those qualities seem to disappear when the resonance is increased.