Ability to Speak in Multiple Channels

As the owner of a community that uses Discord as somewhat of a radio. I often have to speak to multiple channels at once so they can hear me and what ever announcements I have to make. I don't want to have to go to multiple channels at a time to communicate the same message verbally. 

I would like a feature where after holding down a key bind, your voice is heard in all channels of the category you are in.