downloaded 1.8.4 cd installation then went to scratchlive.net to download the latest version 1.9.2 then i got the wheels for my deck to play tried to play music but no sound it shows on the screen that it is playing but no sound i switch to phono mode and the time code record sound

You should connect the outputs of your SL-3 into line level inputs on your mixer. Make sure the toggle switch for each channel of the mixer is set to line.

On the screen below each virtual deck is a THRU button. You want to unhighlight it to hear sound coming from Scratch Live.

Put a song on the virtual deck and put it into INT mode. Press play on the screen and after doing the above, you should hear it.