Max -
I do not think you need to go to the trouble of a reset. Unlike the other two way Beomasters that require either a Master Control Panel (5500, 6500, 7000) or Beolink 5000 or 7000 (4500, 5500, 6500, 7000) the timers are fully programmable from the 9500 control panel.
Check the upper display and you will likely see "TIMER" lit up. Touch "TIMER" on the lower panel, and the light will go off. Now when that pesky program goes off, it will start playing but it will not play through the Speaker 1 or powerlink sockets. To clear the program, press "PROGRAMMING" and 3 "buttons" will light up: "PLAY", "RECORD", and "CALL". Press "CALL" and on the upper panel it will show each program with the time and the source. "CLEAR" will light up and you can clear the timer by pressing it. Keep pressing "CALL" to review the programs, and clear each one. Similarly, you can press PLAY or RECORD, then the source you want, then touch CLOCK and program in the time to go on. Touch STORE to store the program.
Since the 9500 is designed to provide music to a Master Control Link throughout the home, it can send music to link rooms. By turning the TIMER light off and cutting out the main speakers, it will then play the programmed music in link rooms but not in the main room.
All this is described on pages 34 and 35 of the Beosystem 9500 user guide. One last note - the Beolink 7000 remote goes so beautifully in form and function with the 9500, I highly recommend you get one.