Is it possible to use the S/PDIF connection on the Tone 1 as an input, while the USB connection is used to change the volume?
I am using Volumio (Raspberry Pi 3) with a HECATE USB interface (https://www.audiophonics.fr/en/diy-interfaces/armature-hecate-lt-usb-interface-spdif-xmos-xcore-208-asynchronous-tcxo-diy-version-p-12799.html) connected to a Behringer DEQ2496 which sends the data to Tone 1 (powered via Pin 1 and 21). Both interfaces can be used in volumio and the volume can be changed, however using the Tone “only” as a DAC with volume control ( via MPD configuration) does not work. Also using alsamixer directly while the audio output is sent from the Hecate doesn’t have any effect.
Can somebody elaborate if this is a hardware “issue” from the Tone itself (like: only excepting volume commands via I2C when SPDIF is used) or a configuration issue on the alsamixer side?