Hi there !
I've built a custom guitar and I've put 3 magnets.
1 single on the neck, 1 hum backer on the bridge and 1 piezoelectric.
I use only 3 volumes (1 for each magnet) and a general volume. No switches for choosing a magnet.
I must have done something wrong because the piezo does not work so good. I can barely hear it.
Could someone please make a correct wiring diagram ?
Thanks so much for your effort !