Here is a link to download samples.
http://www.mtu.com/support/audio.htm
I've actually used finished products with vogone on two occasions. I processed the file initially and then pasted any extended non-vocal sections back in so that while I was not singing the audience could hear the full instrumentation. (Vocal reducers do thin out sounds other than vocal)
I am happy with the way the songs came out.
If you need to key change the song when you perform, buy MTU's Keyrite also and process it before/after Vogone. I sang my second project using the Location's key changer and the sound was utterly destroyed. The next-day after processing with Keyrite, I was very happy with the results.