Tvheadend

I have a pctv292e usb stick connected to tvheadend for receiving dvb-t /dvb-t2 broadcasts. Everything seems to work fine HD channels are picked up and tune fine. But my only issue seems to be the sound. No channels will play surround? I'm sure its something simple but of anyone can help in letting me know what i'm doing wrong I would be grateful.

I'm running version 4.3-1789~g6bfeca6c0
On a raspberry pi3+
uname -ao = Linux raspberrypi 4.19.37-v7+ #1216 SMP Thu May 2 13:32:40 BST 2019 armv7l GNU/Linux
cat /etc/*-release = PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)
dmesg can be found here http://paste.debian.net/1081984/

looking into /var/log/messages I have this info when starting a stream.

http: 192.168.1.26: using ticket fe8c1e3753db42d9d03f6d12817b20a06a9828a9 for /stream/channel/c0a325df1ebb53da211ba626f2196ae1
May 7 19:57:40 raspberrypi tvheadend[2660]: mpegts: 522MHz in dvb-t - tuning on Silicon Labs Si2168 #0 : DVB-T #0
May 7 19:57:40 raspberrypi tvheadend[2660]: subscription: 0005: "HTTP" subscribing on channel "BBC One HD", weight: 100, adapter: "Silicon Labs Si2168 #0 : DVB-T #0", network: "dvb-t", mux: "522MHz", service: "BBC ONE", profile="pass", hostname="192.168.1.26", username="xxxxx", client="VLC/3.0.5 LibVLC/3.0.5"
May 7 19:57:40 raspberrypi tvheadend[2660]: linuxdvb: Unable to provide BER value.
May 7 19:57:40 raspberrypi tvheadend[2660]: linuxdvb: Unhandled ERROR_BLOCK_COUNT scale: 0
May 7 19:57:40 raspberrypi tvheadend[2660]: linuxdvb: Unable to provide UNC value.
May 7 19:57:47 raspberrypi tvheadend[2660]: mpegts: 522MHz in dvb-t scan complete