Ive recently bought a used Bass Amplifier which came without a user handbook. So far, Im impressed with the amp but, so that I can get the best out of it, I would appreciate some further detail of user settings etc. Ive looked for it on the Marshall website, but havent been able to locate anything yet. The amp appears to be about 20 years old, is marked 200W Integrated Bass System' and has the Serial Number 05610. If any of you are able to supply me with any further details or links to them, I would be most grateful. Unfortunately, as Im based in Saudi Arabia, its not really easy to pop round the corner to my local dealer.