Introduction - If you have any usage issues, please Google them yourself
This is a speaker can be used to control the pitch c language source code, c language, it is worth looking at.
Packet : 693921控制扬声器音调的 c 语言源码.zip filelist
CTONE/
CTONE/PIANO.C
CTONE/PIANO.EXE
CTONE/SOUND.DOC
CTONE/SOUND.EXE
CTONE/TONE.C
CTONE/TONE.DOC