The biggest challenge and change is the customizable Toast Notification.
You can not change the sound it makes or even remove all the sound (default setting for it).

Btw you can change the icon by going there: C:\Program Files\SoundSwitch\img and replacing the png by your picture (keep the same filename). This is an easter egg, not a voluntary feature.

Beta

Change Log

v3.12.0 (2016-09-24)

Full Changelog

Implemented enhancements:

• Update to .NET 4.6.2 #118
• Accessing ‘help’ at any time #105
• Request: Notification pop up with custom sound? #73

Fixed bugs:

• Don’t switch to already default device #117