It is set up in the 'Works with Sonos' section of the 218 Configuration.
The 218 Configuration is a web interface, browse to the IP of the 218 from a PC, or use the Configuration link in the Meridian Connect App.

You will need latest 218 firmware to get this 'Works with Sonos' setting in the Configuration, I will email you to discuss updating 218 firmware.

Rick


Audio Images, 284 Glossop Road, Sheffield, England. Tel: 0114 273 7893
Website: www.audio-images.co.uk Email: Click here to email Rick