Boss BF-2 and CE-2: 1 pedal?

[Steben]

I just compared the BF-2 with the CE-2 and noticed only few things change.
1. BF-2 has a regeneration feedback loop which can be set to zero, almost resulting in CE-2.
2. BF-2 has a manual control which lifts the oscillator sweep which also can be set to not being there.

So how can I do the final touch in making a perfect chorus/flanger pedal? switching between C30 values? 39pf for flanging and 68pf for chorus?

[Mark Hammer]

A few key differences between chorus and flanger designs:

1) Generally different (but slightly overlapping) delay ranges (which you've noted)
2) Generally overlapping but different LFO ranges; in contrast to flangers very slow sweeps do little of use with chorusses
3) Presence/absence of regeneration capabilities (no regen in chorus pedals because it does nothing of use/interest)
4) If same BBD chip, different filtering because of differential risk for audible clock noise/leakage; chorus pedals often use a 1024-stage device with generally slower/lower clock frequency, so they need more aggressive lowpass filtering to keep the clock noise out.
5) Better matching of wet/dry levels.  With chorus pedals, a precise 50/50 mix of wet and dry is not needed since it is the time stagger and pitch bend that forms the brunt of the heard effect does not depend on precision mixing.  For flangers, the notches are the key element, and notch depth depends very much on the mix.