Joyo Ultimate Drive Tonesucking

[niektb]

Hey all, I'm rearranging some stuff on my pedalboard but the Joyo Ultimate Drive is giving me troubles! Right now it sits just in front of the multi-effect that I use (Line6 M5). i've set the M5 to true bypass mode just to make sure it doesn't affect my drive sound. However, whenever I bypass the Line6, the volume drops tremendously and the treble is affected as well. So I'm guessing I have a tonesucking problem, the cause being the poor drive capability of the Joyo. I've tried it with a different reverb pedal (also true-bypass) with the same results...
So the question of course is... How do I fix it in the most easy way? 

I have a slightly modded joyo, here is the schematic

[antonis]

Depending on what impedance JOYO OUT drives, I'd lower R11/R12 Values by a factor of 10..
(C10/Tone pot value should need re-arrangement but it should be easy to obtain..)

[j_flanders]

https://www.thegearpage.net/board/index.php?threads/variable-impedance-output-of-ocd-issue.1933344/
Or the countless other threads about this OCD 'issue':
http://stinkfoot.se/archives/1732
https://www.google.com/search?q=ocd+volume+drop

[niektb]

im fully aware thay a buffer would fix my issue (that seems to be the solution suggested most along with lowering the value of the volume pot (which I already did)) but that's not what I m after since i have more unbuffered pedals (and they work fine). So I'm looking for a schematic fix (and lowering these 22k and 33k seems a very good option, thanks!)
but I have not found a solution on the internet that also gives the values for the tone control

[alexradium]

i tell you what i did to this same pedal,i rewired the buffer in front of the circuit to the output,using a NPN transistor instead of the fet,and making it a true bypass,it is a bit of work but in the end you get something that works.

[niektb]

Depending on what impedance JOYO OUT drives, I'd lower R11/R12 Values by a factor of 10..
(C10/Tone pot value should need re-arrangement but it should be easy to obtain..)

I tried this suggestion and it definitely boosts volume and brightens (both of which are good things IMO) at the expense of the switch which isn't doing a lot anymore but the buffer issue is definitely still there. Simulation confirms that there is quite a bit of volume difference...
How much lower can I make the volume pot?

[Steben]

Depending on what impedance JOYO OUT drives, I'd lower R11/R12 Values by a factor of 10..
(C10/Tone pot value should need re-arrangement but it should be easy to obtain..)

I tried this suggestion and it definitely boosts volume and brightens (both of which are good things IMO) at the expense of the switch which isn't doing a lot anymore but the buffer issue is definitely still there. Simulation confirms that there is quite a bit of volume difference...
How much lower can I make the volume pot?

After the buffer lots!

[Steben]

Depending on what impedance JOYO OUT drives, I'd lower R11/R12 Values by a factor of 10..
(C10/Tone pot value should need re-arrangement but it should be easy to obtain..)

What, lowering resistors? 

[antonis]

What, lowering resistors? 

Of course but NOT for noise issues..!! 

[niektb]

Pot took a while to be deliveder but it's finally in! This is what I ended up doing:


Lowering those 33k and 22k resistors with a factor 10 definitely brightens the pedal up, but that's not a bad thing IMO as it was quite dark before