Designing a 3-channel mixer with diode distortion from scratch

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In this episode, we're building a basic DIY mixer with a slight twist: built-in diode-based distortion. Probably a good project for beginners. If you want to build along, here's the bill of materials:

2x TL072 dual op-amp
2x 1N4148 diode
3x 100k potentiometer
1x 20k precision trimmer
8x 100k resistor
1x 27k resistor
3x 1k resistor
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