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WDM vs. MME Drivers
In almost every situation, the newer WDM (Windows Driver Model) sound card
drivers that most sound card vendors are creating are a much better choice than
the older MME (Multi-Media Extensions) drivers. If your sound card vendor has a
WDM driver, by all means use it. The following table compares their
characteristics:
ASIO Drivers
SONAR supports ASIO drivers. You are limited to a single sound card when using
an ASIO driver.
To Use an ASIO Driver
Use the following procedure to enable SONAR for use with an ASIO driver.
1. Select Options-Audio to open the Audio Options dialog.
2. In the Audio Options dialog, click the Advanced tab.
3. In the Playback and Recording section, select ASIO from the Driver Mode
dropdown menu.
4. Restart SONAR.
Queue Buffers
SONAR allows you to set the number of queue buffers in the Audio Options dialog
box, in the General tab. A higher number of queue buffers will take longer to fill,
and therefore cause an increase in latency. A lower number of queue buffers
decreases latency, but may cause “dropouts.” The default setting is 2. For more
information, see the online help topics: “Mixing Latency”, and “Dropouts and
Other Audio Problems.”
WDM… MME…
Lower latency Usually higher latency
Works with Windows XP, 2000, ME,
98 SE, but not 98 Gold
Works with Windows 98, and ME. Some
MME drivers may work with Windows 2000.
Most sound card vendors have
produced a WDM driver.
MME drivers are widely available.
Note: If you use two or more sound cards at
the same time, and not all of them have
WDM drivers, you must force the WDM
drivers to function as MME drivers. Do this
in the Audio Options dialog box on the
Advanced tab by checking the Always Use
MME Interface Even When WDM Drivers
Are Available checkbox.
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