I was intending to make my own PCBs, either a single PCB or modules, because I have the knowledge and it wouldn't be the first time for me to make a PCB design. Buying a premade printed board would kill all the fun :) Also I didn't go for the multichanel, multieffect, scratch mixer because I think that a simple design like this is ideal for a start. It has all the basic controls and later on, when I figure out how things work on a higher level, I can make a better mixer. Altough I think I have understood the most of the circuit design. I just want somebody to confirm the connection of the PIC and the AINX2 module, and is it necessary to have a digital and the analog ground level or is one GND ok? For me the time isn't crucial, it's the good design, which is suited for my needs, that counts!