AllPlay Relay creates a UPNP MediaRenderer on your device. From that point on you can use another music application that is UPNP/DNLA capable eg BubbleUPNP to send music to the renderer. AllPlayRelay then forwards the music to any combination of speakers that you choose.Speakers must be AllPlay compatible.It has been tested with BubbleUPNP in mind so works well with that client. Due to the complexities of Upnp it is possible some clients don't work 100% correctly. I will be happy to look into problems with those clients if you send a bug report.