Daphile USB Dac/Amp Fiio BTR3K

Hi,
I have just installed Daphile on an X86 PC
All is good apart from the fact that I cannot get any sound on my Fiio BTR3K USB DAC/Amp.

This is my server config

Server

Version: 8.3.1 - git353c504 @ Daphile 23.01-x86_64
Hostname: daphile
Server IP Address: 192.168.0.151
Operating system: Linux - EN - utf8
Platform Architecture: x86_64-linux
Perl Version: 5.36.0 - x86_64-linux-thread-multi
Audio::Scan: 1.02.6
IO::Socket::SSL: 2.074
Database Version: DBD::SQLite 1.72 (sqlite 3.40.1)

Daphile correctly recognises the Fiio BTR3K as an audio device and in the settings>audio devices I have

Device Audio : USB Audio [hw:1,0]

The Daphile FAQ makes reference to changing Mixer settings but the only Mixer options I get are ALSA = Natural or Linear

Neither setting enables sound

1692183478201.png
1692183526118.png


I have previously used the Fiio BTR3K successfully when connected to an RPi running PiCorePlayer

Any Ideas ?

Thanks