That’s an interesting use in itself, I’ve yet to prod JackAudio stuff (beyond failing to get Aeolus to work on an old Debian 10 + Athlon A8 laptop I was messing with).
When I look at the specs, it looks like there are five pins on the DAC+ ADC Pro at P4:
2 Master clock
(22.5792MHz for 44.1, 88.2, 176.4 kHz sample rates, 24.576MHz for 48,96,192kHz sample rates)
3 Bit clock (frequency = 32/64* sample rate)
4 Frame clock (frequency = sample rate)
Assuming they’re the same pinout as the DAC+, anyway.
Which makes me think this:
Would connect to that bus - but would it need anything beyond the power and signals?
I don’t want to choose between - I’m happy for the analogue outputs to sit there being outputs, and literally want to mirror the output on an optical port. I’m certainly not looking to have software selectable or appear as extra outs - rather, to avoid doing the obvious ‘cable spaghetti’ answer of using an external audio ADC from analogue outs to S/PDIF, thus converting twice!
Because I don’t have a Zynthian yet, I don’t know how you’d set the sample rate, but figure it would be easy enough to say 24 or 16 bit, 44.1 or 48KHz, and then that’s what the HiFiBerry is decoding anyway?
The biggest issue I’d have with the software side is Cubase likes one audio interface - so I’m not sure how happily it would play with audio over network from a Zynthian while still using the Audient for analogue I/O.
Aside from the build for XLR ins/outs - I’m used to TRS balanced or TS unbalanced 1/4" jacks on /everything/ - I think the HiFiBerry DAC+ADC Pro is pretty much perfect, bar the lack of S/PDIF out. I think I’d want to add a switch for dynamic mic jumbers if using it as a vocoder or similar, but getting instrument to line level is at least relatively easy.
So if that little and inexpensive board would fix it for an optical digital connection to my DAW’s audio interface, I’m a happy bunny - if not, I’m now pondering pulling an older interface out of retirement.
Being sniffy about USB is hard in a world where Firewire’s unstable (my old interface) and Thunderbolt is expensive - or I have to get a newer USB-C Mac and interfaces, even more expensive!