I left those ones alone for the time being, as I like how much clarity they off. I increased C12, C16, C19, and C20. I upped R20 to 820kNiiiiiiiiiiiiiiice. Which parts did you change to alter the gain & bass? R4, R5, C3, C4?
Yes, my mistake. Meant R21.R20? Don't you mean R21? C19 & C20 are already so large that making them bigger won't change the sound. C12&R16 roll-off below 160Hz, you moved it down to 16Hz. C16&R20 also roll-off below 160Hz, but since part of the DRIVE pot is in series with R20, the 160Hz roll-off moves down in freq when you turn DRIVE CCW. R18, R19,C14&C15 create a gradual roll-off below 1.1KHz.
Yes, I used SPST, but SPDT will also workThey are just on/off SPST switches correct? I love this idea, just don't want to put the wrong stuff in.