- I get an error message installing the Windows driver!?
Please send the usb_audio_setup.log from Windows/Temp and setupapi.log from Windows folder along with the name of the soundcard you tried to install.

- Do I need to reinstall the driver if I want to use a different USB port?
Mac: No. Windows: With most units: yes. That's part of the Windows concept. Only a few products take advantage of technical possibilities avoiding that.

- There's no sound output?
Most common reasons - Cubase: audio's disabled, click on enable audio. Logic Audio: Set the tracks to "ASIO" (ASI means ASIO).
iMic users: If this is the first run there might be an init problem, enter the volume control tab and toggle the checkboxes.

- The driver's input check box is not selected by default!?
Mac OS 9: Trash the driver's preferences. (E.g. "PGUBSDriverSettings" and "usb-audio.de ASIO driver".)
Mac OS X / Win:Reinstall the driver.

- Using a USB hub I get bad performance, any solution?
If you use a USB2 hub the data might be delayed due to necessary buffering on changing the speed. Use a USB1.1 hub instead if it's a USB (USB1.1) full speed product.

- Error Message: "Could not be loaded" / "No ASIO driver" / "Out of memory" / "At least two audiochannels needed"
The USB driver had not been loaded properly. Try plugging the interface after the boot process.
Win: If this doesn't help: Install the driver again. Extigy: disconnect Extigy from the power supply for a few seconds before restarting the computer after installation.
Mac: You can check if the driver's loaded using "AppleSystemProfiler" ("Devices and Volumes"). The "PGUSBAudioDriver" extension has to be activated within "Extension Manager" and you need at least Mac OS9.0.4.
If you're using Digidesign's Mbox disable the Digidesign USB extension in order to use the USB ASIO driver.

- Audio disappears or turns into full scale white noise after a while
If your interface is based on a TAS1020 chip (e.g. the "Trio"), get a USB PCI card like this one.

- Time after time I hear crackles on audio output, what can I do?
Win: Switch off the "Intel SpeedStep" / "AMD PowerNow!" BIOS option on Windows laptops. Checkout this tool: http://www.diefer.de/speedswitchxp/index.html
Sometimes this problem is also caused by cables and hubs. You should use high quality USB equipment only. Possibly it is caused by limited computer performance (e.g. using "highspeed mode"): switch to another mode.
In some cases with early devices it might be a silicon issue of hardware incompatibility that only effects the output path. If your interface provides a digital input select it and leave it open. While the driver is switched to "internal" it provides the sample rate generation and you should get dropout-free output. Don't forget to switch back for recording.

- What's the "extern" / "intern" sync switch about?
Extern: recommended option and necessary for recording - the interface or a digital source is generating the sample rate
Intern: only for playback - more accurate sample rate generation by the computer

- I can't playback audio CDs via USB?
Mac: Switch the "PG..." extension and replug the interface.
Win: The CD drive must be able to read audio CDs in digital mode. To select this enter Start -> Settings -> Control panel. Open "multimedia", select the folder "Audio CD" and activate "enable digital CD-audio for this device".
DMA datatransfer has to be enabled for using CD audio. Enter Start -> Settings -> Control Panel, open "System" and select the folder "Device manager". Select the CD-Drive in the list and click on properties, select the folder "Settings" and enable "DMA" in the "Options" group.
If the CD drive (or driver) does not support DMA transfer or digital audio, it's not possible to play audio CDs via USB.

- Using Griffin iMic / PowerWave the application crashes as soon as I launch my application. Is there a solution?
Plug in the USB audio interface after launching the application.

- What will be added by the next updates?
More devices will be supported as soon as they are available and suitable for the driver.