some sound notes

experiment/production/Sound-Notes.md

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+Sound Notes
+===
+
+```
+vol=75
+chan=`amixer controls | grep Volume | head -n1 | cut -f1 -d',' | cut -f2 -d'='`
+amixer cset numid=$chan -- ${vol}% > /dev/null
+```
+
+Plugging the 3.5mm jack into the HDMI display.