What is the [R][R][R][R] [A] in the title bar?

[EnjoyRC]

I'm sure it's quite obvious, but what is the [R][R][R][R] [A] in the title bar? Sometimes some are lit up, sometimes not.

[TheVoice]

I was wondering the same thing.

[Vincent Burel]

R= Remote Client (up to 4 clients)
A= Audio Client (example: Graphic EQ 15).

shows the remote status, when an application gets connected to Voicemeeter (e.g. MacroButtons).

'A' is specific to Client application connected to one of the 3 audio callback (click on A shows the connected applications on audio callback).