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There could be a workaround:
One could change the input waveform "manually" for the next period, basically applying an ultra-smooth gain slew right into the samples. That would require knowing the...

Until one evening, tired enough, simply decide "enough of this noise" and stop for the night, forget to turn the volume down before pushing that virtual "off" button while the sounds still...

Wild guess here; the amplitude changes happen at a rate that matches the high pitch you hear... In which case the explanation would be that the amplitude change is done as a simple sudden step...