1. Defective CD
   Often it is simply that the source CD is defective (e.g. scratches) - test and see if the interference noise appears on other CDs.
   NOTE: The error correction on different CD-ROMS is not always equally good - we have seen cases where one CD-ROM really only read "rubbish" and another CD-ROM was able to read the same CD perfectly - if necessary try and read it with another CD-ROM!
   
   
2. CD-ROM, which can not read audio correctly:
   Unfortunately many CD-ROMs are not capable of reading audio-data correctly.
   In the Feurio!® CD-Manager under "Program" -> "Program-Parameters", call up the function "Test Device". If the device test determines that the drive does not read audio data correctly, there is not much you can do (except use another CD-ROM). In individual cases changing the parameters (e.g. activating "Jitter-correction") can improve the read quality - 100% correct read-out is however not possible with such a CD-ROM!
   CAUTION: The device test of course does not provide any absolute statements - even the device test can't find all faults in the drive. In principle the device test works by reading a section of a CD several times and the data is then compared respectively. If a device always provides the same incorrect data, then the device test will not find a fault.
   On this, look on the Feurio!® Homepage (http://www.feurio.de). Under "Supported CD-ROMs" you will often be able to tell if a CD-Rom can read audio correctly or not.
   
   
3. Problems with replay:
   In individual cases we have seen that the data has been read correctly and it is just the replay via the soundcard which is not working correctly. In particular when trying to use "old" Windows 98 drivers under Windows 2000, this effect sometimes occurs.
   If the interference noise always appears at different places however and ONLY when being played in the Feurio!® Wave-Player/Trackeditor, but NOT on a burned CD, then the fault can be found on the soundcard or the soundcard driver.
   Please check and see if there is an update for your soundcard and/or contact the soundcard vendor's Support.
   
   COMMENT:
   Another possible source for playback errors can be an extremely high system load and in particular other time-critical processes (e.g. scanning, Soft-Modem etc.).
   If the Wave-Player or the soundcard driver does not get enough computer time to prepare the data, then interference noises can occur.
   During "normal" operation interference noise should not occur due to the higher process priority of the wave player - if, however, other time-critical processes are started, it can of course happen that they "steal" the necessary computer time from the Feurio! Wave-Player and/or the soundcard driver.
   In particular drivers for "Parallel port scanners" often have the habit of blocking the system to such an extent that playback errors occur.

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