Apollo Thunderbolt Software Manual Working With Apollo 25
Windows WDM System Audio Operation Notes
Windows WDM system audio is used for audio input and playback in media players, web
browsers, audio conference, and similar programs.
To ensure proper audio system functionality, follow these guidelines when using Apollo as
the input and/or output device for Windows WDM system audio.
• Disable system notification sounds. Turn off all Windows system alert sounds
using the procedure detailed on the previous page.
• ASIO and WDM sample rates must match. All sample rate values in ASIO DAW
programs and WDM audio programs must be set to the same sample rate. If the
ASIO and WDM sample rates are not the same, audio from one or more programs
will not be heard correctly.
• WDM sample rate changes. Set the sample rate in the Apollo Console
Settings>Hardware panel before changing sample rates in the Sound>Playback
or Sound>Recording control panels within Windows. Note that WDM programs
may need to be closed then reopened to be heard correctly if the sample rate is
changed in the Sound control panel within Windows.
• DAW sample rate changes. If the DAW sample rate is changed, WDM audio will no
longer be heard correctly because the sample rates no longer match. In this case,
the WDM sample rate must be changed in the Windows Sound>Playback panel to
match the DAW sample rate.
Additional Windows Optimizations
• Visit the Apollo Knowledge Base at help.uaudio.com for updated technical news
and system optimization information.
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