Lich King - BBD Chorus

Great BBD chorus, PCB is perfect and easy to build.
During effect use I hit problem with very loud cracks when some digital pedal is in front of this chorus (DigiTech Drop pedal in my case). I tracked problem to missing high freq cut before BBD, so I added 1n cap in parallel to R4 in the feedback of U1A opamp, which adds LowPass with cut around 3kHz and everything is OK now. I also developed extension with two pots which adds ability to control Tone of the Wet signal, and control of the Wet and Dry blend ratio. With all these mods I'm very happy and I have pedal with really great sound and effect variability.