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I'm trying to use soundflower and co. to record desktop sound, but I'd like to be able to adjust the volume of my headphones simultaneously.

The volume buttons adjust soundflower if I set the system sound device to soundflower and use LineIn to PlayThru to the headphones (same problem with soundflowerbed), or the volume buttons don't work at all if I use an aggregate device.

What can I do to make the volume buttons control the headphones and not soundflower (which I always want to be at max)?

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I did eventually get around to solving this using ControllerMate and Multi-Output Devices instead of LineIn.

Using Audio MIDI Setup I created a Multi-Output Device that outputs to both Soundflower and my headphones:

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Now use this device for system-wide sound output.

Then using ControllerMate and an accompanying AppleScript I was able to 'bind' the volume buttons on the headphones (I use Apple's standard earphones) to controlling the headphone/speaker volume only:

enter image description here

(Apple Mikey HID driver is what ControllerMate calls the controller associated with the buttons on the headphones)

The AppleScript for lowering the volume:

set volume alert volume ((alert volume of (get volume settings)) - 100/16)
set volume (alert volume of (get volume settings))*7/100

and for increasing it:

set volume alert volume ((alert volume of (get volume settings)) + 100/16)
set volume (alert volume of (get volume settings))*7/100

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