JamesBass, it's a 2004 so no push/pull knob but it does have a standard and 'rick-o-sound' stereo output, other than that I just assumed it's the same as any other 4003, saying that I've only played two others but they felt very similar. Hope that helps.
J
Sorry Spoonman I missed your post.
According to the internet, Blueboy was the colour of the year for 2004. These are quite rare, I had to wait ages to get this one and paid a hefty premium over a standard 4003, I recall it being something like £1650. I have owned it for 2-3 years.