The 3pk has the ability to change the tone (100 tones in all) of its beeps and probably that is why you thought that its similar to a schulze shuttdown beep.
The name is Alawi. You can call me Al.
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Go to the third menu and then choose the term SYSTEM. There you have six modes where you can toy around with. Choose the 4th mode which says: BUZ-TONE: choose from between 100 different types of tones. The higher the number is, the sharpest the tone is and vise versa.
The name is Alawi. You can call me Al.
Nice to meet you!