Ah makes sense. I haven't used xmms in ages. For JESS you should be able to substitute the space key for the Back/"escape" key which the N800 has. Works for me.

As far as Infinity goes the toggle for full-screen is the Tab key. I had to plug in a USB keyboard to test that and well it goes to fullscreen for about 1ms and then crashes the plugin and it's just a black screen.

Know of any other visualizers?