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I prefer to leave the Master volume at 100% and just adjust volume with PCM.

I used this askubuntu answer to separate the controlling of each of these channels.
Unfortunately the volume applet and notification pop-pup are linked to the master channel.

How can I change these to give me information on PCM audio channel instead of Master?

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I've found my answer here in another ask Ubuntu answer.
If I use that script and change the mixer from 'Master' to 'PCM' I get a good pop-up notification of the PCM volume changes.

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