You can use URL-commands from the Squeezebox Server-Software. We have been working on a voice control plugin and although it does not fully work yet, you can use the info from this plugin to implement URL-commands from the Squeezebox Server. Here is the installation-link: http://shop.max2play.com/media/downloadable/beta/voicecontrol.tar
Once installed, it generates some example commands based on your setup (mac-address, etc.). You can also look into the links below, wherein you can find all necessary commands. The second link is especially helpful and more structured and detailed.