Eurorack MX1604A

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Andres donated a mixer! It's a little noisy on the pots and switches so I took it apart! I don't think there's much to do but what do I know. Here are some resources

It's full of these dual op-amps

http://www.njr.com/semicon/PDF/NJM4580_E.pdf

Someone wrote about "an upgrade". Hmmm.

http://www.instructables.com/id/Audio-Mixer-Upgrade/

The pan pots on the 4 mic preamps pretty suck.

It has a weird feature where it has "alt 3 + 4" outputs, so technically, it's a 4 channel output. The mute buttons on the channels seem to double as a output bus router.