Re: System Mute Problem
Re: System Mute Problem
- Subject: Re: System Mute Problem
- From: Jeff Moore <email@hidden>
- Date: Mon, 09 Feb 2009 11:58:37 -0800
Does this device work properly with Audio MIDI Setup (in /Applications/
Utilities) and/or HALLab (in /Developer/Applications/Audio)?
On Feb 9, 2009, at 11:24 AM, Gordon Rankin wrote:
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.
--
Jeff Moore
Core Audio
Apple
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