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21. Hotline – Troubleshooting<br />
The newest information can always be found on our website www.rme-audio.com, section Support,<br />
Macintosh OS.<br />
Playback works, but record doesn’t:<br />
• Check that there is a valid signal at the input.<br />
• Check whether the Hammerfall DSP has been selected as recording device in the audio<br />
application.<br />
• Check whether the sample frequency set in the audio application (‘Recording properties’ or<br />
similar) matches the input signal.<br />
• Check that cables/devices have not been connected in a closed loop. If so, set the systems’s<br />
clock mode to Master.<br />
Crackle during record or playback:<br />
• Increase the number and size of buffers in the application.<br />
• Try different cables to rule out any defects here.<br />
• Use an external FireWire drive for the audio data. Internal SATA drives overload the system<br />
bus in some Macs, thus disturb PCI audio.<br />
The card and drivers have been installed correctly, but playback does not work:<br />
• Is Hammerfall DSP listed in the System Profiler/PCI? (Vendor 10EE, Device ID 3FC6).<br />
• Has Hammerfall DSP been selected as current playback device in the audio application?<br />
<strong>User's</strong> <strong>Guide</strong> <strong>HDSP</strong> <strong>AES</strong>-<strong>32</strong> © <strong>RME</strong> 35
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