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It turned out that to balance the piezo alone wrt the pick ups alone I had to replace the fet with a 2n5457.
The acoustic sound is also less "boxy" (is it a real adjective???) but the parallel still doesn't work, though a slight change in the piezo is audible.
I'm thinking about removing the ON-Z-ON switch and using a push-pull potentiometer instead, removing the parallel option.

By the way, the tone in the schematic works very well for the magnetic pick ups but not at all for the piezo, any suggestions? I'm planning to try some different cap, I can't add another potentiometer or replace the existing one. I discovered that my old acoustic guitar had no capacitor on the tone control, I'm wondering how it was working.

I've replaced the fet with a J201, R2 with a 2.2k and the trimmer with a 25k to get a correct biasing. This has increased the output impedance and the magnetic pick ups are a little bit more audible in the combined mode, but it could be much better. On the other hand I have to play a little bit with the biasing because the piezo alone now is louder than the pickups alone.
To be continued...

I almost finished a solid body with three single coils and electronics more or less like a strat.
As an experiment, I added a piezo transducer with a little preamp built around an MPF102. I have another preamp like this in my acoustic and works very well. In the acoustic, however, the piezo is under the bridge saddles and has a higher output, while here I have a single piezo element (aka buzzer) somewhere stuck to the body (well, under the neck pick up). First thing, I'll try to replace the jfet with a j201 to have a bit more gain and try to balance the output a little bit wrt the magnetic pick ups.
The main issue, however, is that I used an ON-Z-ON toggle switch, so that I can have both magnetic and piezo circuits together but there's some impedance problem and the result is that when they are in parallel the pick ups are basically inaudible. If I remove the battery, the pick ups can be heard as a far far away sound.
Here's the schematic:
https://drive.google.com/open?id=0B5Uj9BTxpfvLR3VwR2dkaFFTbnc

Any idea? I'd like to leave the magnetic pick ups passive...


EDIT: I just realised that I open this thread in the wrong forum, can someone please move it to the proper place, like "Open Discussion"? Thanks

Yep, me too, that's why I'm still convinced it's a switch problem, but it was easier to try and install a couple of resistors than replace the switch

Little update on this: cleaning the switch contacts mostly fixed the pops problem but not entirely, so after some thinking I installed a couple of 22M resistors in parallel with the caps and the switch and this seem to have completely solved the issue. I'll test it some more but it looks fine so far, and the resistors' value is so high that it's hardly affecting the frequency response of the filter.

Man, you should change your nickname to Houdini...

Yep, it's what happens with mine. Good.

Thanks 
I found the picture on some site, adapted it to the size of the enclosure adding some colour fade at the bottom, and added the text. I thought it would fit with some purple around, and I'm quite happy with the result.

Hi guys, I finally managed to put together this nice little circuit. I had some issues with the decal and the colour printer at work and it took me way too much time to finish the enclosure. Not to mentioned that when I got the decal printed to perfection the first time, I didn't spray enough coating on it and the ink started to smudge during the application
I borrowed the image for the graphic from some website, I'm not that creative 

About the circuit: the central position of the switch (Vibe) is so subtle that at first I thought it was not working at all. Is it how it should be?
I find the other positions just great.
Enjoy:
https://drive.google.com/open?id=0B5Uj9BTxpfvLbXdUTUNSYWRqams
https://drive.google.com/open?id=0B5Uj9BTxpfvLeVMxS0NPZVF3Rlk

Yes, it makes so much sense that I did it myself in my previous build, and not only for the stereo pots
I'm just lazy, if I can find the right pots at a decent price I would save a lot of time. And since I'm designing a new board, knowing upfront what components I have available could make a lot of difference.

Well done, sir! (I love Marquee Moon )

Yes, great, thank you very much!

Is anybody aware of a source for dual PCB pots in Europe (-> Germany)?
I'd need two for a project but couldn't find any.
Something like this:
http://alphapotentiometers.net/html/16mm_pot_22.html

Sometimes we forget that family should come first, second and third (but close second), then, maybe, the rest.
Take care of your boy, the world will still be there when you both are back.

Cheers,
Max.

Yep, I'm surprised too, but I'm a lazy guy, so before de-soldering a 2PDT toggle switch from a PCB I'd try anything