hi Kusi!
those boxes like I used for Buffy you can buy at
www.elfa.seCheck out the Reichelt also, i've seen a components to build those boxes there (2xDPL + 2xKOH). Not exactly the same, but the idea is similar.
Yeah, the clicks&pops from relays can be PITA.. ;) Most of my switching devices are controlled by Atmel uCs, so i can precisely set the timing of the switching procedure, for example:
All outs Muted
wait some ms
do the switching
wait some ms
all outs Mute off
As muting elements some FETs, or optoFets can be used. I use mostly H11Fx series opto-fets.
I hope You like the TubeTank :) I've got some ideas for new versions of that pedal...
Thanks for the greets for Lena, she will get them fast! :)
Regards!
Peter