While the mixer controls six volume levels, the channels are not mapped one-to-one with the rotary encoders. I found that I only need fine control over five audio channels: Master, Chrome, Current, ...

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LILYGO T-Encoder-Pro is a rotary encoder based on Espressif Systems ESP32-S3 WiFi and Bluetooth SoC, equipped with a 1.2-inch AMOLED with touchscreen support, and two Qwiic connectors for expansion.

The T-Keyboard-S3 Pro adds ESP32-S3, STM32G030, magnetic links, a fifth screen/encoder, and supports 6 devices in a 2x3 grid.

There’s a lot to like about this little remote, which is based upon a LilyGo TTGO ESP32 board with on-board display. The circuitry is basically that and a rotary encoder plus a tiny LiPo battery.