How to add a tone control on a ROG May Queen

[Renegadrian]

I have to build a May Queen for a friend, he told me he likes to have a tone control to cut some highs when needed.
I tried the typical tone control found in a lot of pedal - like this one.
So it's a 47nF cap tied between the output before the volume and a 100kB to ground (I also tried a 5kB). It should cut highs that way....
No that doesn't work, it seems like it ain't doin' anything....
Anyone can suggest me how to implement a valid 1 pot tone control to cut some highs in the May Queen?! THX

[brett]

Hi
that tone control is messy, and the values look wrong to me (could be me). 
IMO you'd be better off with a simple 1 pole filter, consisting of a 100k pot in-line (wired as a variable resistor, where the 0.22uF cap is) followed by a 0.001 uF cap to ground, then a 0.1 uF cap to the volume control.  Simple, works.  Same layout as a Rat's filter control.
cheers

[Renegadrian]

brett, thx for the reply. Why do you say that it's messy?! I know that's the easiest way to wire a simple high pass filter (the more you turn the pot CCW the more highs go to ground). Fulltone Fat Boost, OCD and a lot of other pedals spot that simple solution. Valvecaster too...Maybe it's just a twist of the components...
.22 µF cap^? Where is that!?
You say to wire pin3 of the pot after the 100n cap, pin2 with a 1n to ground, and a 100n to pin1 going to volume pin3?!

[Renegadrian]

Basically it's the 2.2 nF cap that filter the highs - the higher the value the more highs are filtered.
So how can I wire a pot with a 47n or 100n cap and adjust how much that cap affect and filter the sound?!

[stringsthings]

http://www.muzique.com/schem/filter.htm

[Renegadrian]

I tried to wire a pot and a cap like this...

pin 3 of a 1kA pot to pin 3 and 2 of the trimmer and + side of a 1µ cap to that pin too
pin 2 neg. side of the above cap
pin 1 to Q3 (where the other side of the caps should be)

It works, but there's some tone attenuation even when the pot is maxed...Better ideas?!

[Hanglow]

tried the SWTC?
http://hammer.ampage.org/files/SWTC.gif
http://www.muzique.com/lab/swtc.htm

[Renegadrian]

Right, sometimes the easiest solution fits...
SWTC with 470r as R1, 22n for the cap and a 50kB pot. No cap at the trimmer. Works very well. Simple, stupid but just what I needed!!!

[Hanglow]

Glad it worked. The next Mayqueen I make will be a three knob one I think, I really like the original but while the overdrive is really controllable with the guitar volume I think it would be handy to have a gain control and a tone control too