I have worked with severial Via MOBO's (good stuff) Some of them
do beep through the external speakers. I never tried the jumper
on a Via. The boards I've worked with had the speaker plug spanning 4 pins. My msi MOBO is the same. the speaker wires,
one on the left two unused then the second wire.the jumper goes
on the two unused pins. I hope this helps. be careful. If you try it please post which board and the results.