Arm/disarm chirp volume - successfully lowered it using:
Buzzer level low, Ausgelesen, Werte=00
Buzzer level high, Ausgelesen, Werte=00
Buzzer frequency, Ausgelesen, Werte=7E
Buzzer duration, Ausgelesen, Werte=04
Hope this helps others- it is much more pleasant now and I prefer it to being silent.