Hi,
I cannot give you specific advice on the E- quite simply there are something like 38 variants made by the manufacturer and outof which I really liked one and little did I care what it contained.
Now discussing mysteries of capacitors......hm where shall we start?
Ok let's begin with tanatalum capacitors......if you'd bias them in reverse they'd distort and SMD variants and also the ceramic SMD caps can change gender and become resistors or even zenerdiodes- yes this has been studied by the swedish military..........
There's an excellent article in Electure about biasing capacitors and there should be at any decent library the german study on distortions in capacitors.......
Look you have an output cap that is loaded by what ? a 10K pot? Come on just use basic corner frequency calculations and that will bring you in the ballpark and then calculate the number of alike filters in the system and you'd get that the composite corner frequency will be the squarequadrant of the number of filters.....yes it is tedious but simple computation.
Do not ever be deluded by capacitors but study the effects and you will know there is no magic only a way of controlling circuits your way- now define what is your way............
I shit you not you can take that cap that you are thinking about and see how it works in the circuit and it is not hard and then you make an educated decision on what you'd like to do......
Ahum microphonics in capacitors- use your hands as probes and you will be in the know.
If you think that a difference of a filter consisted of a near zero Source Z- and yes that's the axis that would point right of the surface of your mathematics book and poke you in the eye-driving a capacitor of 10 uF loaded by 10K and you can compute that in your head to 1,153159....... Hz.
Yes right this is not the only filter but you need to know it all to compute.....................
Hey go read Walter E Jung........
Come on use your ears and I shit you not I get tired of this.
At any rate have fun
BJ