Different keys

To introduce an amplifier…

Volume, necessarily
When the forum is secure, its loudspeakers tested and working, and any threat of silence past... privacy is then a sort of afterthought for some.

To reinvent the old utility…

Delicacy and finesse
A megaphone with lesser volume, to take care not to stir the watchers... there are many.  

The song is a different song, depending on its key…

I wrote a letter, I mailed it in the –
I mailed it in the air indeedy –
I wrote a letter, I mailed in the air.
You may know by that
I’ve got a friend somewhere.