Hush is a new feature introduced on the Zipp and Zipp Mini. It’s designed for situations where you need to quickly lower the speaker volume momentarily (such as if you get an incoming phone call).
You hush a speaker by placing your hand over the entire Touch interface. This will instantly lower the speaker's volume, allowing you to hear what you want to hear. Lift your hand, and the music will resume to the original volume level.
Note: If you are listening to a group of linked speakers, hushing a speaker will not hush every speaker in the group - only the one where the Hush is performed.