Fuzz face output capacitor blending with potentiometer - possible?

[Johnny85]

Hi everyone

I was thinking of doing this to the output of a negative ground, NPN germanium fuzz face:



I'd use (for example) 0.01 uF for C1 and 0.047 uF for C2.  If R1 was just a switch, I suppose that would let you choose between more and less "bassy" output signals from the FF.  Using a pot (I'm thinking 1 M) for R1, I *think* I could then "blend" the output signal between the two caps.

I'd like some input from you experienced builders 

Is this possible?  Has it been done?  Does it raise any weird issues?  Is my circuit missing anything important, or do I need to change the value of the output pot?  What values would be good for R1, C1 and C2?

Answers to any or all questions greatly appreciated.  Even if it's just to say it's a dumb idea (but please say why)

[Gus]

Things you need to think about.
When you add a series output resistor what does it do to your output resistance and what the circuit can drive?.  This will matter when you are not fully CW or CCW.  Think about what happens in the middle to start.  Also what happens when you have different input resistance devices after the FF type? 

I am more of a fan with adjusting the high pass at the input of a FF type circuit.


Look at this there is an adjustable high pass before the distortion section.
http://www.aronnelson.com/gallery/main.php/v/gus/plus.GIF.html?g2_imageViewsIndex=1