1) Download oss-linux .rpm from here
2) Convert it to .deb package with alien -d --scripts oss-linux-v4.0-1016.i386.rpm
3)Stop all the applications using your sound card also the gnome panel applet
4) install converted .deb package dpkg -i oss-linux_v4.0-1017_i386.deb
( also you can directly download the .deb officially released package from here, checking which one is good is up to you )
5) Reboot the system and run ossxmix there you can find four seperate controls for front speakers and three jaks and many controls to configure the sound card.
6)By checking input-mix-mute in mixer as rounded above image, you will be able to cut the noises.
7)To enable microphone find int-mic in mixer window (I have rounded it above image) and uncheck it if it is already checked checking all other inputs before using the mic is a good idea, to do that check all the boxes. To check the mic open voice recorder and record some sound and check.
8)If you want to add a menu entry to ossxmix coppy following to /usr/share/applications/ossxmix.desktop you will be able to see ossxmix in your 'Sound and Video' sub menu
[Desktop Entry]
Name=Ossxmix
GenericName=Oss Mixer
Exec=ossxmix
Icon=gnome-mixer
Categories=GTK;AudioVideo;Audio;Player;
Terminal=false
Type=Application
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