A pretty easy build.
It's from a company called Ljunggren Audio.
I sadly cant find them on line anymore.
Hopefully they will return one day.
These are the virgin boards. I's a 4-channel mixer/attenuator with 2.0x gain and 5V offset on each channel in an 8hp module.
" Ampmix was designed as a handy CV mixer and processor with buffered
inputs but its low-noise circuit means it will also work great with
audio, even with full gain.
A 2.5V voltage offset is generated then normaled to the inputs of the 4
channels, giving them a maximum of 5V out each with knobs turned full
clockwise (2.0x gain). Please note that these offsets will affect the
mixing if the channel hasn't been patched on its input or output, so
turning all unused channels fully counter-clockwise/left (off) is
advisable for a clean mix"
https://modwiggler.com/forum/viewtopic.php?t=99573
So if you are using this as an audio mixer, make sure that any unused channels have their knobs turned fully counter clockwise.
Most of the components are pretty easy to obtain except for the Zener
The LM 4040 2.5V voltage reference zener
Mouser
926-LM4040AIZ25NOPB
The ICs are TL074s and 072s
.....
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