How do I get update notifications on XFCE?

How do I get update notifications on XFCE? -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/1438910923.5660.1.ca...@inbox.lv

Mixing 4 audio sources

This is semi off-topic as it's partly a hardware question, but I don't really know a better place to ask. I have a hardware mixer on my desk to connect four sources of audio to one pair of headphones. It's breaking, I need replacement, and I also would like to free up the desk space it's taking, s