Hi Philippe_kertesz,
The Moode Audio maybe support, but i haven’t test this, you could have a try.
For the DAC(ESS9038Q2M) controlled by Tone2’s MCU(I2C), it need to develop the Moode Audio system to support filter and volume control(or more function you want to control).
More info about the UART control interface could see this: tone2-uart-instructions-description-240107.
The opensource info please see this, it include mcu(stm8s003f3) and xmos(xu208) code and develop info.
