The high-pitched beeps are PC Speaker sound, which DOSBox emulates and puts through your soundcard instead of your machine's PC Speaker.
That, or if you're running DOSBox with machine=tandy, it's the emulated Tandy-1000 sound chip - a little better than PC Speaker, but not much...
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"God. Can't you people see I'm trying to commit a crime against science and nature here?"
-- Reed Richards
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