[Bram] decided to make his own, powered by a Raspberry ... device is to play audio, onboard filtered PWM wasn’t going to cut it, so instead a 24-bit DAC talks to the Pi via I2S.

After preparing Vaultwarden, your Raspberry ... adds a DAC hat to the Pi and some host system controls, but note that processing digital audio via CamillaDSP will not work on a Pi Zero W.