Re: More Master Mute info
Re: More Master Mute info
- Subject: Re: More Master Mute info
- From: Jeff Moore <email@hidden>
- Date: Mon, 09 Feb 2009 14:07:51 -0800
The fact that mute is being implemented by adjusting the volume seems
to me to be an indication that the USB Audio class driver on the
system is not able to recognize your master mute control for what it is.
I'm not intimate with the details of how the USB Audio class driver
maps what's in the device's interface pages with the controls it
exposes through the HAL. So, I hesitate to give you any advice here.
Your best bet is probably to engage our developer support folks so
they can hook you up with the appropriate people on our end to figure
out what's going on.
On Feb 9, 2009, at 1:20 PM, Gordon Rankin wrote:
Jeff,
From: Jeff Moore <email@hidden>
Subject: Re: System Mute Problem
To: CoreAudio API <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Does this device work properly with Audio MIDI Setup (in /
Applications/ Utilities) and/or HALLab (in /Developer/Applications/
Audio)?
Here's is what I am doing...iTunes output out the dac to powered
speakers.
If I set the Mute check box in either the Sytem Preferences or Audio
Midi it only mutes the Left speaker.
Otherwise this product works fine in all regards.
Again the Mute is listed as the Master Channel and the volume is
Right & Left front as it should be for stereo.
What I don't understand is why OSX is Muting as a function of
volume. If it sees the Master Channel Mute it should use that for
Mute and not set the Mute as a function of Volume = MIN as it seems
to be doing for the Left channel. Then if you uncheck the mute it
resets the Left channel equal to the previous on setting.
I am going to post that on the USB list as well as I get that also.
--
Jeff Moore
Core Audio
Apple
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