Picoreplayer v7000, Benchmark DAC2 HGC, Rpi4, USB no sound

Been messing around with this for a couple of days and making no progress so looking for any advice to help me fix the problem.

I have a RPi4 and I'm trying to output through USB to my Benchmark DAC2 HGC but I am getting no sound from the speakers. System all works fine using the digital inputs on the DAC2 so no problem with amps or speakers.

On the Rpi I am using piCoreplayer V7.0.0.0

I have disabled the onboard audio on the Rpi.

Squeezelite output setting is 'hw:CARD=B20,DEV=0', ALSA setting 80,4,blank, 1, blank

On the DAC2 the 'U' and '44' leds on (not blinking).

ALSA shows:

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aplay -L gives:

tc@piCore4:~$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault
Default Audio Device
default
plugequal
equal
hw:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
Direct hardware device without any conversions
plughw:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
Hardware device with all software conversions
sysdefault:CARD=B20
Benchmark DAC2 USB Audio 2.0, USB Audio
Default Audio Device
front:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
Front output / input
surround21:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
4.0 Surround output to Front and Rear speakers
surround41:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=B20,DEV=0
Benchmark DAC2 USB Audio 2.0, USB Audio
Direct sample mixing device
tc@piCore4:~$

Any suggestions?

Thanks, Stuart

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