i have a very old Line6 Flextone amp, that doesnt really work to well, so i decided to try and modify it; this is the problem that has arisen.

1 ; i have no clue about circuitry, but im quite tech smart and able to catch on
2; id like to have my preamp bypass the effects , and amp models, basically have a basic preamp with a gain stage, 3 band eq, and bypass the rest, leaving the master volume, gain, bass mid treble, and channel volume,

no clue how id really do this , but if someone were able to offer a bit of advice it'd be greatly appreciated