Quick mixer question

[graygem]

In this little mixer circuit, is C6 and C8 both necessary? C6 is a 100uF and C8 is 4.7uF
This is from Red Circuits Mini Mixer with a tone control added on the end.

[indianajo]

It looks like a pi filter, but without the resistor values it is hard to figure out what they are doing. Fiters have a time constant of R*C, etc.

[graygem]

Thank you for replying.
It's not a filter. C6 and R15 are the output of the redcircuits.com mini mixer circuit, and C8 is the input from the tone control circuit I used. I am just wondering if both capacitors are really needed or if just one will do the trick, perhaps C6 which, as I said, is 100uF.