beep_* routines
The beep routines are the base for all beep patterns that are created by the system.
there are normal versions of each beep and short versions of each beep. The higher the number, the higher the tone of the beep.
Eg.: beep_f4 plays a higher note than beep_f2. beep_f1 and beep_f1_short are the same note, just that the short note only plays for about half as long as the normal one.
