The dual filter effect is great, but it's easy to miss the mid-way point when sweeping a dial back - so I think it would be good to have separate high pass and low pass filter effects, in addition to leaving the dual filter as is.
This would give greater control over the range of say a high pass sweep with a dial, since you can now use the whole dial, not just half. It would also avoid accidentally missing the mid-way "off" point.
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