Different Joinserver Soundfile Every Map Change

[SiOps]

I have recently rented a game server and am running the latest Mani Admin Plugin. I know you can specify cvars like sv_gravity for each map on the server by naming a.cfg file after the specific map and placing it in /cfg/mani_admin_plugin/map_config. With Mani I am able to play a sound file when a user first joins the server, but it plays only that one sound for every map. So, I need to somehow specify a different sound file to play for every map.

Anyone have any ideas?