Don: The mp3 tracks are on a tablet the output going to the VH aux input, it is then mixed with the vocal in the VH. The output from the VH can be Mono or Stereo dependant on what PA you are using or if you are using a camera with an audio input the VH headphone output goes to the camera.
There are thousands of backing tracks on YouTube and if you use a program such as "Freemake" you can download just the audio as an MP3 file, easy and free. If the audio is in the wrong you can use "Audacity" to change the pitch.
I also use the following site the tracks are £1.50 each and are descent quality.
http://www.karaoke-version.co.uk/Tony: The gig I was referring to is only a few minutes away from home, I'm to young to be a resident.
The mic I use is a TC Helicon MP75 which is well matched to the Voice Live Touch 2 with a button on the mic to introduce the harmony. Most of my audiences are very close and I feel more part of them when I sit down I sometimes also use an Acoustic Guitar to help the presentation not necessary the sound
Thanks' to everyone for the kind words.
Col