setting default mic and speaker device when installing usb drivers

[nikola.mediavoice]

we have a usb key which manage 3 audio devices.
2 microphones (mic1 and mic2) and 1 speaker (speak1).
when windows vista automatically installs the drivers when we put the
usb key on the usb port we want the driver to set the "mic1" be the
default input device and "speak1" the default output audio device.
how can we accomplish this?
how should we tell the driver to do this programmatically?

thank you in advence
regards
Nicola

 

[Bob F.]

we have a usb key

Could you describe this key? Who makes it? Model? What is it supposed to
do?
Bob F.

which manage 3 audio devices.