One For All Wireless Transmitter

Does anybody know if there is a driver and/or add-on available to allow One For All wireless transmitter USB dongle to be used with a ReadyNAS NV+ v2? The device works by monitoring the sound output and transmitting it to its receiver, which is then plugged into your stereo.

I'm looking for an alternative to the expensive Sonos stream receiver and as I already have the One For All it seems a good place to start.

Thanks

Ian