Clark Gainster Clone - Bass (Bottom) Control Not Working

[Gahoo]

Hey all, I'm building a couple clones of a Clark Gainster for a local music store and I'm having trouble getting the Bass control to function. It's built exactly as the original except for the internal trimpot which we're mounting as a 4th control. As it stands now this control (called Bass, Bottom, and Presence depending on the circuit) is having no noticeable effect on the circuit. I've tried disconnecting and reconnecting lug 3 of the pot, effectively removing the whole element from the circuit, and didn't notice any difference tonally. I guess I'm wondering if the values I've selected aren't giving me enough range to be noticeable?

Any advice would be greatly appreciated!

Original Schematic: http://i14.photobucket.com/albums/a303/call1800ksmyazz/BarberBigBoxGainster-1.jpg

The schematic as I've laid it out: https://i.gyazo.com/9adaff19df665d04bda8492b07926f4d.png

My board layout: https://i.gyazo.com/2fa4ede74b5f0416415ece0e9e752b3c.png

Thanks!

[slacker]

Using those capacitor values the bottom control won't do anything, the 100n cuts frequencies below 3Hz and the 1uF cuts frequencies below 0.3Hz, the caps need to be much smaller to do anything useful or the volume pot needs to be much smaller.

[Gahoo]

Replaced C7 with several smaller caps and still didn't get any noticeable effect. I also pulled one leg of R9 to shrink the effective value of the pot with no change :/ . Any other ideas? I'm kind of surprised that the values posted in that schematic would be wrong, I've seen a couple variations all with those values...

Thanks for your help!

[slacker]

Sorry I was wrong before, I've just had another look at the schematic and the way it's drawn the pot basically doesn't do anything, which is why you're getting no change. I thought it was blending the larger cap in parallel with the smaller one, which could be what it's supposed to do but it's not, even then it wouldn't do anything because the caps are too big.
If you want it to do something, replace the 1M resister with a jumper and make C5 on your schematic 1n and C7 100n, that should give a variable bass cut, adjust both cap values to taste, no idea if that's anything like what the original pedal does.

[PRR]

There will be more load than the 500K level pot. Unknown.

Change Level to 10K. Now your 100NFd cap will cut at 300Hz, even if external load is 50K or some lower.

R9 1Meg makes no sense: "bass resistor" changes only from 100K to 91K, bah. Make R9 Zero. No good reason to have any limit (stopper resistor) on this, since all it does is bring-up the 30Hz-300Hz range that the 100nFd+5K was cutting.