Homerun Sounds:
Press or Square to hear horns or Circle to hear whistles while running around the bases after hitting a homerun. Note: Set the Sound FX volume to maximum for best results.

Grand Slam Hitter:
Enter SLUGGER at the create a player screen.

110 MPH Pitches:
Enter STRONG ARM at the create a player screen.

Unlimited creation points:
Enter ICHIRO at the create a player screen.

Thanks to Revolution readers Eric Barbre and Booger Bastard!