System Mute Problem
System Mute Problem
- Subject: System Mute Problem
- From: Gordon Rankin <email@hidden>
- Date: Mon, 09 Feb 2009 14:24:10 -0500
- Organization: Wavelength Audio, ltd.
I am not sure if this is core audio or USB...
Anyways, I designed a USB Digital to Analog converter which has system
wide volume for Left and Right as well as system mute. As seen in the
enumeration below:
Audio Class Specific Feature Unit ID: 7
Source ID: 5
Control Size: 2
Number of Channels (ch): 2
Master Channel:......................... ( Mute )
Left Front:............................. ( Volume )
Right Front:............................ ( Volume )
Feature Unit Name String Index: 0
~~~~~~
The volume works fine but in the System Preference if you check the Mute
box only the Left channel is effected as whatever controls this action
is taking a snapshot of the present volume and then setting it to zero
to mute it. But is only doing this to the left channel.
In other words the mute is not being acted on at all but merely the
volume is used as the mute and it is broken because it is only doing the
left channel and not the right channel.
All other operations are working fine. Volume, Balance etc... all work
fine.
This works fine in all other operating systems.
Thanks
Gordon
--
J. Gordon Rankin
Owner and Chief Scientist
====== Wavelength Audio, ltd ======
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