Played around with this circuit today. The gain control between pins 1 and 8 on IC1 works well, but I just couldn't get the bass boost to work at all. I tried a 10k pot and a capacitor between pin 1 and 5 on both the first and second IC's, and all I got in both cases was a drastic volume reduction, and a kind of staccato stammering in the output signal.
To be fair, I don't actually have a 0.033uf, so tried using both a 0.01uf and a 0.047uf. Capacitor values confuse me, and my understanding of what's happening is limited, so it's possible it was never going to work with those values, but the volume reduction and stammering signal surprised me. Is it likely to be the capacitors causing it? Or is it more likely to be operator error, and I'm just doing something wrong somewhere?
For what it's worth, I thought it may have been a dodgy potentiometer, but tried two and got the same thing both times.
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