Since upgrade to Windows 7 64 bit I can't turn the volume all the way down by using the volume control at the front of the notebook. Worked fine under Vista 32 bit.
The volume control still works but no matter how far I wind it to the left there is still sound coming from the speakers.
As far as I know volume control in the past was mechanical but now it works on different way and it is controlled by specific tool/utility.
To be honest Tecra P5 is not known to me but obviously it is Australian notebook model and according to Australian support page this notebook model is not supported for Windows 7.
That doesn’t mean you cannot use it but this means there is not software package designed for Windows 7 that can be installed so I think there is no much you can do about it.
I know it is annoying but for volume control you can use Windows option placed in task bar.