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17. Hotline – Troubleshooting<br />
17.1 General<br />
The newest information can always be found on our website www.rme-audio.com, section FAQ,<br />
Latest Additions.<br />
The input signal cannot be monitored in real-time<br />
• ASIO Direct Monitoring has not been enabled, and/or monitoring has been disabled globally<br />
(for example in TotalMix).<br />
The 8 ADAT channels don’t seem to work<br />
• The optical output has been switched to SPDIF. The ADAT playback devices are still usable<br />
by routing and mixing them in TotalMix to other outputs.<br />
Playback works, but record doesn’t<br />
• Check that there is a valid signal at the input. If so, the current sample frequency is displayed<br />
in the Settings dialog.<br />
• Check whether the H<strong>DSP</strong> system has been selected as recording device in the audio 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 ‘Settings’ dialog or in the application.<br />
• Try different cables (coaxial or optical) to rule out any defects here.<br />
• Check that cables/devices have not been connected in a closed loop. If so, set the system’s<br />
clock mode to ‘Master’.<br />
• Increase the buffer size of the hard disk cache.<br />
• Activate Busmaster mode for the hard disks.<br />
• In case of a recently done BIOS update of the motherboard: Propably 'Load BIOS Defaults'<br />
was loaded instead of 'Load Setup Defaults'. This sets the 'PCI Latency Timer' to 0 (default:<br />
32).<br />
Low Latency ASIO operation under Windows 2000/XP on single CPU systems:<br />
• To use ASIO at lowest latencies under Windows 2000/XP even when only having one CPU,<br />
the system performance has to be optimized for background tasks. Go to >Control Panel/<br />
<strong>System</strong>/ Advanced/ Performance Options