Fix: This occurs if a system’s soundcard is ISA based — common for standard on board audio solutions (since Windows cannot automatically take a setting away from an ISA soundcard and give it to the PCLink). It will also occur if you are running an audio program when you plug in or unplug the PCLink. Make sure to therefore close all audio programs before doing this. You may need to configure your computer manually by selecting USB Audio Device in the Multimedia Control Panel or the Sounds and Multimedia Properties control panel. See the section “Checking that the PCLink is selected as preferred device” (page 7) earlier in this manual for further details.

4 My PCLink seems to be introducing pops and clicks

Problem: You have installed the PCLink and it seems to be recording fine, except there are pops and clicks every now and then.

Fix: Some USB host controllers do not function within USB specification. Also Windows, in conjunction with other hardware in your system, may be consuming all the isochronous bandwidth of the USB bus. Both of these interfere with the data flowing to the PCLink, causing it to randomly add pops and clicks. The main instances where this occurs is if:

•USB frame rates are out of specification – isochronous data transfer (required for audio) is not possible via USB with a frame rate that is too fast or too slow.

•Controllers do not enumerate devices correctly – some controllers do not send USB resets at the appropriate times or may enumerate one part of a composite device.

•Corrupting audio data – some USB controllers introduce artifacts into sound data (i.e. CATC traces of USB data have shown non-zero vales in data that should be all zeros).

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