I do proper walk ups for most teams and use some players files for different players.
Doing the math if you did every 25 man roster that is 750 slots.
I use about 500 slots for walk ups. The rest is stadium sounds (I love haveing every park with their unique personality), chants and yells.
I mix up a nice variety of vendors, and fan yells. Every park has it's personality and all players on the MLB roster have walk ups.
Let's say a certain player has Modern Rock as his default. But I don't have his file...I will just use a different players walk up who has a modern rock song.
My own division (AL East) is done to a tee. The rest I use some duplicates so i have more than enough room for stadium sounds, TV broadcast themes, yells and cheers, vendor yells and umpire yells/jeers. player jeers and cheers.
For stud players I fill up their cheers and jeers (Give it a ride, MVP, get some Wood on it) and then some jeers ( Overrated, What are we paying you for, we will rock you).
I have that stadium sounds file with all kinds of walk sounds, stolen base sounds, etc etc. I mix in stadium music with broadcast music between innings to give things a fresh sound. Some parks don't have stadium music between innings some do, some have that mix between stadium and broadcast sounds.
I have tons of files with all kinds of yells and chants that I kept from last years starter packs. So much you can do. I really get deep with SOTS. I can't play this game without it anymore.
No freaking way.