BEEPLEX -- "Beeper lexfile".  Adds CHIRP, MGUN, SING, and ZAP to
BASIC.

Size: 206 bytes.

CHIRP causes the error-beep sound but without causing an error.

MGUN makes a machine-gun type of noise.

SING makes a happy upward sweep of notes, useful for notifying the
user that they did something right or that something good happened.

ZAP is the opposite of SING. It causes a depressing, downward sweep of
notes.

Great for game programs and programs that take a long time to run.