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SB PiCorePlayer & external USB DAC (TeddyDAC-USB)

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I have a Pi running PiCorePlayer v1.16 wirelessly connected to LMS 7.9.0 running on an Odroid with Debian SQLite 1.34.
I also have a HiFiBerry card attached which gives me the ability to play 192kb streams via RCA outputs to the Preamp.

I've now invested in an external DAC (TeddyDAC-USB) to improve the sound further. This DAC is 192kb capable.
I've configured PiCorePlayer to output to USB only & connected the DAC via USB. I've left the HiFiBerry physically attached but PiCorePlayer isn't configured to use it.

The PiCorePlayer settings I used are:
Output settings - sysdefault:CARD=X20
ALSA settings - 80:4::
All other Squeezelite settings are blank. Perhaps this is where the problem lies, but I'm no expert in this. Educated guesswork so far.
Under "List available ALSA devices, it shows an option of Output settings:
sysdefault:CARD=ALSA - bcm2835 ALSA, bcm2835 ALSA - Default Audio Device
but I haven't used this as I don't understand the other settings I'd possibly have to use. It plays streams, & possibly not HiRes ones, but at least it plays!

I'm able to play 192kb streams, but the DAC's HiRes indicator doesn't light.
I know the stream is HiRes as the SB Controller tells me it's playing at 5010kb VBR & 24/192. It hasn't downsampled as the Pi isn't synced to any other player.

I just want the Pi to act as a streamer & for the DAC to do everything else - including dealing with 192kb streams, but the DAC doesn't appear to recognise a 192kb stream or the HiRes light would be lit.
I imagine Squeezelight configuration is the issue, but a TeddyDAC-USB isn't in the list of tested USB DACs yet so I don't know which settings to use.
I haven't upgraded to PiCorePlayer 1.17 as I don't want to screw everything up.

Please can anyone advise? Let me know if you need more information.

Many thanks.
Paul

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