Help adding a high pass boost to an SVF schematic.

[garfo]

Anyone can help me here?
I have this schematic which is working but would be nice to add a high pass/bandpass function around 3khz to use as a boost only on this frequency.It would be on and off using a toggle.
I saw someone suggesting adding a parallel network around R3 and C3 on an old thread of freestompboxes.
I used Paint to edit the image and do a parallel out of the section and wanted to know if it's possible to do it.Perhaps the way I did is not the way to do it.Could anybody help!?
After all, how would I miix it back in, after (green), or before(red) the last opamp stage???.
Sorry for the bad drawing technique

[kothoma]

Varying R3/C3 could give you a treble boost, for example with a parallel path (like in a Rat distortion).
The red and/or green lines are not needed (and wouldn't work, the red would disturb the SVF and the green would only add lows to the output).
In essence C determines the cutoff frequency and (TR1+R3)/R3 the gain for high frequencies.
(These are damped by the following lowpass, of course.)

[garfo]

Ei Kothoma, I've just realized the part of the circuit I've drawn it's wrong. The 47n cap is not connecting to ground and the line should come out from Rx, I believe.
I've made another one, let me know if like this it makes more sense.
If not, how could I add a treble boost(high pass) without changing anything else on the system?The idea is to do the pick attack that exists on the Wal basses.
I know that they either pull a high pass or a band pass tuned to arround 3khz and mix it with the rest of the signal through an on/off switch.
Can you help me here, is it a simple thing or would I need to duplicate the entire section?

[kothoma]

No, this way you're still routing lows to the output (the highs all go to ground via Cx).
If you simply omit the red line then you get a treble boost, but that will be eliminated mostly by the lowpass.

If I understand you right you want a lowpass with fc anywhere well below 3 kHz and a highpass with fc = 3kHz and a gap between the two fcs?

Then the deluxe version would be to build a second SVF in parallel (everything twice from R4 to P4) but taking the highpass output (C6 connected to pin 7) and maybe a mixer opamp after the two level pots.

But maybe you could get away with a capacitor going from before R4 to lug 3 of P4. That C and P4 will form a RC highpass. Try a 4n7. Together with the 10k pot you should land somewhere around 3kHz, if my calculation is right.