I have recently purchased a used Jx10
minus the manual and I also received 2
sound cartridges Vr101 and Vr102.
The piano sounds are dreadfully tinney
and there are no drum sounds that i can find
In short I cannot really get a decent sound
from what I beleived to be a Quality synth.
Can anyone help ?

The JX10 is definately a quality synth, but that's exactly what it is. It's an analog synthesizer (albeit digitally controlled oscillators) but it's not a sample playback machine which is what you seem to be trying to use it for.

It does not have drum kits, nor can it really emulate other acoustic instruments. It's strength is producing analog type pads, lead sounds, basses etc. This is what people people buy it for. What you require is a multitimbral sample playback keyboard that can produce different sounds simulataneously over multiple midi channels. These weren't produced for a couple years after the JX10 series came out.

You wouldn't try to play piano on a MOOG and the same applies to the JX10 pretty much other than some tine like electric pianos. If you are on a tight budget you may have to sell the JX10 and buy a multitimbral synth. Though I'd keep the JX10, use it for synth sounds and pads exclusively, and add a cheap multitimbral module like a Roland Sound Canvas or JV module, or alternately a multitimbral sound card for your PC like Yamaha's XG synth cards. Once you hear what the "analog" synth sounds are like that come with sample playback modules, you'll realize that they don't compare with the warmth and fatness of synth like the JX10. So perhaps don't sell it until you realize what you actually have got, and can appreciate it.

Hope that helps explain things.