Graham, as expected on point one thanks

point 2, 'Transmission errors' more of my area, unlike the data generation stuff

Simple enough theroy really, totaly isolate the incoming data stream from ALL FORMS of interfernce, until it reaches the output phono's on the cdp/dac, then just carry that on down the rest of the chain until it comes out the cones/panaels or horns

If you can do that, I'll buy into the company

Seriously for a moment now, where do feel the main contamination paths for the data stream lie ? electromatic/radio/microphonic and power supply induced, dependant on specific design? of a combination of some or all.

Having modified a few players of the same model and preformed different methods (clock/outside psu/dual diffing the dac chips/d/filter mods/sheilding/isolation/damping amonst others) on a few,  the results often threw up quite different, but none the less enjoyable beneifits, have made a few notes along the way, would be intereted to see if any of the theriores fits the results, and coralations thus gleened. Wm