Aux input in Boss+Volt

I do not know exactly where to locate this post, in Amp or in Dac.
The question is: If I use a Dac Allo Boss plus an Amp Allo Volt, can I access an Auxiliary input? How? The idea is to amplify other sources besides Volumio.

No, for those you want to use the Volt+, which works like a standalone amplifier:
just switch the input beetween volumio and the aux input and you’re done…