xev | grep -A2 --line-buffered '^KeyRelease' | sed -n '/keycode /s/^.*keycode \([0-9]*\).* (.*, \(.*\)).*$/\1 \2/p'

234 XF86AudioMedia
173 XF86AudioPrev
136 Cancel
172 XF86AudioPlay
171 XF86AudioNext
121 XF86AudioMute
122 XF86AudioLowerVolume
123 XF86AudioRaiseVolume

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-FN+F3 (repeated continuosly until i've pressed ESC)
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244 NoSymbol

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-FN+F8 (repeated continuosly until i've pressed ESC)
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170 XF86Eject