Well good news... upon further tinkering... it appears that if I also short pins 2 and 4 on the front Audio header (remember 1 and 3) were shorted to give sound output on the left channel only, then the right channel also works (output being used on the rear port mini-jack).

So this confirms the circuitry is 'ok' as well as the mini-jack in the rear.

What bothers me is why does the front Audio header need to have a resistance btw pins 1 and 3, 2 and 4 respectively.

Again if I remove the shorting bar (thus leaving the Audio header empty) it will completely silence the rear audio mini-jack.

Baffled is one word for it :)

Thanks group, if anyone has any ideas on this Audio issue, or has a ?Venus? board to look at I would be grateful. (I think the venus board connects to the front group of headers on a real Umax S900)

Rob

BTW.... and this out of context a Sonnet G4 / 800 will not work reliably in OSX 10.2 or 10.3 no matter what combination of pieces one tries to assemble, this is of course in an S900 MB. I made it boot into X finally (do not even ask how much time was spent doing that, and permutations). But it would freeze very consistently. (cache/ no cache / disable MB cache).


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