How to change voice prompts in Confbridge

Asterisk 11.15.0
Recently I decided to customize the “Enter your conference pin number” and “The conference will begin when the leader arrives” files to tailer the Confbridge conferencing prompts for our purposes. However, though I could watch the Asterisk cli and see the audio file names that actually were being played, I could not find any place to change them to different audio files. I finally took my own custom *.gsms and gave them the same file names that I could see from the cli that were being played, I deleted the originals and copied my new files into the sounds folder. It works just fine but I’m curious if there is a way to change these sound files with a configuration file. Any ideas?