During gameplay, type in these codes:

Keyboard:
Hold down the 1+2+3+4 keys on the keyboard (not the NumPad) and enter these cheats. Use the arrow keys for the Left, Right, Down and Up.

LEFT, SHIFT, RIGHT, ALT - Sponsor comment
ALT, RIGHT, SHIFT, LEFT - Nickname game
DOWN, CTRL, RIGHT, ALT - Stadium info
SHIFT, LEFT, LEFT, SHIFT - Crowd cheer
CTRL, DOWN, DOWN, CTRL - Crowd ooh
ALT, RIGHT, RIGHT, ALT - Crowd boo


Sidewinder Gamepad:
Hold down both trigger buttons plus Y and Z, and enter these cheats.

X, A, X, C, B, A, LEFT, RIGHT - Home run
UP, DOWN, X, A, X, C, B, A - Strike out
UP, X, RIGHT, C - Histrical commentary
X, UP, UP, X - Crowd cheer


Gravis Gamepad Pro:
Hold L1+L2+R1+R2, and enter these cheats.

BUTTON 4, B1, B4, B3, B2, B1 - Home run
UP, DOWN, B4, B1, B4, B3, B2, B1 - Strike out
UP, B4, RIGHT, B3 - Historical commentary
B4, UP, UP, B4 - Crowd