system
Given the following post, respond as if you're commenting on Reddit:
human
[The Flash] How do the speedster and the team communicate via voicechat? Do they slow the voice down?

Edit: sorry for bad English.
gpt
Speedforce. This is the answer to everything. 

Flash can consciously turn the speedforce on or off or modulate it to fit his needs. 

So he can be moving at mach 125 and communicate by speaking through simply wanting to be able to talk.