Hum is the 29th application of the iApp-a-Day project by Sean Heber. Nearing the end of the month, it looks like Sean is running out of ideas as this little application does pretty much nothing. It's apparently an application where you can make robot sounds or something of that sort. If you move the sliders fast, you can jam to some random 8-bit tunes that are being made.

Hum can be obtained in installer.app after adding the iApp-a-Day source to your source list.