Multible stream to Airplay/uPNP devices in Jukeboxmode?

Hello @all
I'm new to the subsonic forum. I look for the best player with the best functions. First of all, i like subsonic! The fast Webgui and search function, creating playlists and play on different instances of Subsonic. I would like to spent money for this project but i tried 20 different media libraries, player. I miss one "BIG" feature. In my network i have 2x Sony SA-NS510 wireless speaker, 1x XBMC with Raspberry and 1x XBMC on my new very nice Intel NUC device. On the Raspberry i've connected my Stereo HiHi Receiver. My Girlfriend has a Google Nexus Tablet, i got a iPad 4 and we got iPhones. Now we have a party, 4 different Airplay devices and the possibilty to stream Music from DLNA Server to ONE of this 4 devices. But i like a webinterface like subsonic on my HP Proliant N54L NAS Server with the idea of a jukebox and the abilty to stream music from this Server to all Airplay devices at the same time OVER my iPad. My iPad has just opened the webgui from subsonic and subsonic streams the local music from NAS to all 4 Airplay / uPNP devices?
This is a great thing, cause, when your device like android phone, tablet or iPad shut down because of low battery, the subsonic still streams your cool playlist music to ALL of this 4 airplay / upnp devices AT THE SAME TIME.
I never found a media library or player with this function! Why is this not possible? Or is it possible somehow? i dont find the function!
I'm new to the subsonic forum. I look for the best player with the best functions. First of all, i like subsonic! The fast Webgui and search function, creating playlists and play on different instances of Subsonic. I would like to spent money for this project but i tried 20 different media libraries, player. I miss one "BIG" feature. In my network i have 2x Sony SA-NS510 wireless speaker, 1x XBMC with Raspberry and 1x XBMC on my new very nice Intel NUC device. On the Raspberry i've connected my Stereo HiHi Receiver. My Girlfriend has a Google Nexus Tablet, i got a iPad 4 and we got iPhones. Now we have a party, 4 different Airplay devices and the possibilty to stream Music from DLNA Server to ONE of this 4 devices. But i like a webinterface like subsonic on my HP Proliant N54L NAS Server with the idea of a jukebox and the abilty to stream music from this Server to all Airplay devices at the same time OVER my iPad. My iPad has just opened the webgui from subsonic and subsonic streams the local music from NAS to all 4 Airplay / uPNP devices?
This is a great thing, cause, when your device like android phone, tablet or iPad shut down because of low battery, the subsonic still streams your cool playlist music to ALL of this 4 airplay / upnp devices AT THE SAME TIME.
I never found a media library or player with this function! Why is this not possible? Or is it possible somehow? i dont find the function!