VEG, the problem with sound controls is that there can be several of them. You may have an icon on the system tray (bottom right corner of the screen). In my computer there are two icons. One is overall volume, the other is a mixer. The mixer has several faders for the different sound sources. Also under Control panel - Multimedia, under the Audio tab, if I click on the strange button (with a little slider on it), I get another set of volume sliders. According to what your operating system and audio software are, you may have even more controls.