I have been helping a customer develop a custom SFX APO for a USB audio
device. I wrote an INF using the standard wdma_usb.inf as audio driver and
just adding FX registrations for the APO. Works fine.
Now the testing teams says that when playing audio using only the default
windows audio class driver and having made the device "default" explicitly
from the sound control panel, then if they connect a second device audio
will play uninterrupted. BUT if the device has been installed using our own
INF with our APO and playing audio and then connecting a second device
audio will be interrupted shortly (< 1 sec) and then resume.
I am not sure if there even are any guaranties for uninterrupted playback
when inserting a second audio device while playing on an explicitly set
default device?
Regards,
Michael
