Sonifex Pty Ltd T/A Innes Corporation
12/6 Leighton Pl
Hornsby, NSW 2077, Australia
Phone: +61 2 9987 0499
Fax: +61 2 9476 4950
E-mail:
Website: http://www.innescorp.com.au
4
Digitorc 4 Manual
Notes Regarding Windows Version Differences
Windows XP and Server 2003 are the only current versions of Windows that provide complete
support for WDM audio drivers. The following limitations apply when using the Digitorc 4 with
other versions of Windows.
•
Windows Vista / 7 / 8 virtualise the mixer API to each application, providing only a mute and
volume control on each input and output. These controls affect only the audio levels going to
and from that application. A Windows XP compatibility mode is available to provide full mixer
access to the hardware if needed.
•
Peak meters for WDM drivers are only available through the mixer API under Windows XP
and Server 2003 (and Windows Vista running in XP-compatibility mode). Windows Vista / 7 /
8 provide an IAudioMeterInformation interface as part of their EndpointVolume API, but this
isn’t supported on any of the earlier platforms.
•
In all versions prior to Windows Vista, Microsoft’s sampling rate converter, which is
automatically switched in when playing multiple audio streams of differing sampling rates
through a single physical output, is slightly inaccurate when doing some conversions. The
error is typically at most about 0.3%. The most common conversion, that of 44.1kHz to or
from 48kHz, is handled correctly, though, as are simple 2:1 ratios.
