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Audio Fluctuations
Hi Stringer, as a computer eng. I am convinced your sound card is faulty and agree with the moderator on his troubleshooting tip to check that this is the case. (can't see how it could be software generated)
I've had this a couple off times on various PC's in the shop for repair over the years and in each case the fault was caused by the board overheating and/or voltage from motherboard to the ISA / PCI bus fluctuating. If after testing as per moderator then try another sound card. If you have the same problem then have your local shop test the voltage distribution on the mainboard using Microscope or similar hardware testing kit.
best regards
Bruce
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