4U modular analog synthesizer
![UI](https://private-user-images.githubusercontent.com/5844101/306709758-a92c6793-bd27-4dff-a935-6d1c097b11fe.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.vET0m02DxdXga-B8L7jZVT96nVt1F_xwwcbD1NXfnxM)
The panel contains 4 submodules with identical UI. Each unit has:
- 8 banana jacks and 4 potentiometers laid out in a 4x3 grid
- 2 5mm LED
- 2 toggle switches
IO board fits two modules:
![Motherboard](https://private-user-images.githubusercontent.com/5844101/306749031-11c4f1fd-bfec-46fb-9dcc-5b9ce0917704.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.LMUZGTBlANjpmSSjli-du6t0UBjGfKzvhqs8Gb3qAR8)
The modules are installed via two 1x16 pin headers:
![HWUpdate](https://private-user-images.githubusercontent.com/5844101/306749189-26d908db-daf7-460a-9f88-5ef2dae9aab0.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.xzoEZKWAGxaZdDWsAZdPnKtBiMim20gkHAJSyUraRl0)
- 4 channel mixer
- 4 step sequencer
- Function generator
- AD633 multiplier