This plugins transforms your PSP into a Mechanical-sounding alarm clock and works by parsing CONFIG.TB in msdrive:PSPGAME150Time Baby – When the PSP turns on because of alarm, this works by checking the RTC clock and the alarm time in CONFIG.TB if the time matches, it plays the alarm sound [RAW MONO PCM ] in “seplugins/alarm.wav”, which is also customizable.

http://forums.qj.net/showthread.php?t=133718