To realize the comprehensive control of the speaker (bottom right speaker icon), speaker, microphone, stereo mixing, the microphone, the default recording equipment, mute, volume and so on all can obtain, control, and support the xp, vista, Windows 7, doing, win10 system, such as compiled under delphi7, no source code, test, open the speaker corresponding interface, can see the control effect, download address: http://www.dxmylove.com/download/SpeakerControl.exe