Originally I was going to make one large EuroRack style board for all my outs on my rackmount MB-SID. But I got to thinking it might be more versatile across projects to break it up into a modular design and would make it simple enough I could probably etch and drill my own boards without it being a huge pain or could just order a bunch from BatchPCB or even Advanced Circuits probably for cheap. The board has an audio in, mix in, and mix out. Audio in goes into a 1/4" TRS jack. The audio out