This was originally just including the announcer clips from Super Smash Bros. for Wii U, much like the other mod, but later had evolved into this, partially inspired by the Super Smash Bros. All-Stars mod. The Break the Targets and Board the Platforms clips are taken from Super Smash Bros on the Nintendo 64, for example. But by default the clips are taken from Super Smash Bros. for Wii U.
The fighter callouts use the announcer from the game on which those fighters were first added, and also includes the announcer from Super Smash Flash 2 for the fighters where it is applicable. There is also a callout for Cloud if you're using the CMC build of the game.
This pack is assuming that you're using this game's original announcer, and not full announcer replacements like the Energetic Announcer. The fighter callouts from vanilla CMC are still fine, though.
I am planning on uploading a preview video on my channel, so I'll update this description later with that. This pack is also planned to be later updated with applicable Super Smash Bros. Ultimate DLC fighters and new fighters from Super Smash Flash 2.