A soundboard is a computer program designed to let you quickly select and play back short audio clips. The sounds are presented as a grid of buttons, so you can simply click one to play it. Soundboards are used by musicians and radio hosts to ad-lib sounds in a performance, but are also a popular tool for making prank phone calls. You can use Skype with a soundboard program in Windows 7 to call people and play sounds at them.
Right-click the volume control in the taskbar and choose "Recording devices" from the pop-up menu. The "Sound" window appears.
Right-click on the "Stereo Mix" recording device in the list shown, then choose "Enable" if it is not enabled already. If "Stereo Mix" is not visible, right-click anywhere on the list, and enable "Show Disabled Devices" and "Show Disconnected Devices" to reveal it. Click "OK" to dismiss the "Sound" window.
Click the "Call" menu in the Skype window, then choose "Audio Settings." A new window appears.
Choose "Stereo Mix" from the "Microphone" drop-down menu, then click "Save." Any audio that would normally be played back through your speakers or headphones will now be used in place of your microphone in Skype calls.
Launch your soundboard, then make a phone call with Skype. You will hear the person you called as normal, but he will only hear the sounds you play using the soundboard.
Make a Skype Test Call using the soundboard and adjust the output volume to make sure it isn't too loud or quiet. All of the sounds your computer makes will be sent over the Skype call, including any music you're playing or sounds from other programs. Turn off any programs that make extraneous noise before placing your call. If the "Stereo Mix" option does not show up in the list of recording devices, it may not be possible to use it with your audio hardware. Try updating the drivers for your sound card. If this does not work, connect an 1/8-inch audio jack splitter to the audio output jack, then connect one of the split jacks to the microphone input jack using an 1/8-inch patch cord, and the other to your speakers or headphones. Use the regular microphone input setting in Skype.