Audio not coming from indicated output

Guess this is why.(And it *****!)

http://support.apple.com/kb/TS4113

Try HDMI for the digital output while the USB DAC is connected.

I think there is something wrong with their Applescript.

I am using a command-line utility (which you can also run from an Applescript) called SwitchAudioSource and it does exactly what you want, without any problem.

You can compile it from source code from here. I just compiled it on Mtn Lion and tested it, and it does what you want.

Here is how you can use it from the command-line:

zsh-% ./AudioSwitcher -h

Usage: ./AudioSwitcher [-a] [-c] [-t type] [-n] -s device_name

-a : shows all devices

-c : shows current device

-t type : device type (input/output/system). Defaults to output.

-n : cycles the audio device to the next one

-s device_name : sets the audio device to the given device by name

zsh-% ./AudioSwitcher -a

Built-in Microphone (input)

Built-in Input (input)

Built-in Output (output)

AudioQuest DragonFly (output)

zsh-%

zsh-% ./AudioSwitcher -c

AudioQuest DragonFly

zsh-%

zsh-% ./AudioSwitcher -s "Built-in Output"

output audio device set to "Built-in Output"

zsh-% ./AudioSwitcher -s "AudioQuest DragonFly"

output audio device set to "AudioQuest DragonFly"

zsh-% ./AudioSwitcher -n

output audio device set to "Built-in Output"

zsh-% ./AudioSwitcher -c

Built-in Output

zsh-% ./AudioSwitcher -n

output audio device set to "AudioQuest DragonFly"

zsh-% ./AudioSwitcher -c

AudioQuest DragonFly

What I can't easily show you is that it "does the right thing" instantly when I issue the switch command.

If you want to incorporate it into an AppleScript, just use

do shell script "/absolute/path/to/AudioSwitcher -n"

No, it "just works" as you would want it to, changing the output device in real time. I tested it on my iMac at work running 10.8.1.

I put a compiled version of the program on your thread at CA.