I built this circuit on my breadboard:
(http://www.jer00n.nl/pics/opampbooster.png)
It pops every time I turn it on and off (the breadboard is in a true bypass looper), but if I switch the 10u electrolytic cap out for a smaller value film cap it doesn't. I have tried several 10u caps. Pull down resistors don't help. Any thoughts?
try 100k after 10mF and before 'boost' pot to the ground.
I know it's been a while..... but why not use a poly film cap? They sound better than electrolytics. With the 10K pot and a .47uF cap your cutoff frequency is 34Hz, which will even work for bass guitar.
(a) did you get the electro polarity correct, more positive voltage on the + side?
(b) have you measured for DC on the output?
As another thought, it takes a long time for 10uF to fill up through a 100K resistor.