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I have the same problem. According to me it should be caused
by the audio chip: 3DFX VoodooTV FM has a MSP3450G audio
chip and so it's different from 3DFX VoodooTV 200 (US
version has other MSP chip: MSP3440G-A4 and localized
version differ by SAW filters too!)
Dscaler properly operates because it uses its own drivers.
So it has to be added support for VoodooTV FM as actually
there is only support for 3DFX VoodooTV 200.