AudioToy

8x8 channel modular hardware for Teensy 4.0 Audio with balanced inputs and outputs at pro-audio levels.

https://www.pjrc.com/audiotoy-8x8-channel-audio-mixer/

This could be a good inspiration.
The guy made an interesting Technical manual:

2 input preamplifier module designs: one with mic/line capabilities (Combo XLR socket), the other for line/instrument inputs (TRS). All pre-amps can handle balanced or unbalanced inputs. All input module controls (gains and pads) are controlled by I2C, and insertion of a TRS plug into the Combo socket is remotely readable.
An output module capable of driving 600 ohm outputs at +8dBm.

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Cirrus logic CS42448 with 6adc+8dac is discontinued :frowning:

yes.
Pcm3168 is mostly the same: 6INS + 8 outs, all balanced with 2Vrms scale.
In this AudioToy project, there’s a main board with the codec and audio output audio input boards. These ones are interesting with the XLR+jack combo, and all the input preamp stage. I’ve discovered new IC’s :grin:

And they are: ?