Looking in to this. I’m curious if any of you folks that went ahead with just patching straight to the header with no buffer amp, resistor or capacitor inline have noticed any issues over time?
I ask because I have a little experience in modding mixers to have direct outs.
The first couple of things I modified like that worked fine initially. But over time started to act erratic. It turned out that I was working the little opamps to death by patching them naked to the outside world. And this affected their ability to buss the signal to the rest of the mixer unmolested.
I put a little 20k resistor and a 1:1 transformer on each out (it was only a 6x2 mixer) and things started acting normal.
The next couple of mixers I modded I went with an op amp per output. With just a plain vanilla datasheet diagram derived buffer amp, following a pretty high impedance resistor. 100k or 1meg? I forget. Those worked well, but as soon as you get into opamps that provide gain you are modifying the sound of things somewhat. I was doing things on the cheap, so I used a TL072 or TL082. If I did it over again I’d be using a 5532 or OPA2604.
It might be kind of freaky to fit a perfboard up in there. So maybe it could be in a little hammond box that connects via a multipin connector. Which would also carry V+,V- and GND.
I’m going to investigate it at least.