at the prompt from the keyboard input I (i) to enter the frequency rate of change, enter a number, Press Enter, the sound from the loudspeaker, the voice stopped automatically after the return to the previous step, continue to operate, at the prompt or keyboard input from the Q (or q) to withdraw from the process.

sound
.....\sound0.asm
.....\sound0.EXE
.....\使用说明.txt

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