hldj.org

1) Does HLDJ launch the game correctly for you?
Yes
2) Does "HLDJ Loaded Successfully" appear in console on starting the game (with no errors)?
Yes
3) What is the console output after selecting a song, or issuing other HLDJ commands such as "hldj_next"?
What??
4) After loading one of the sample audio files, perform a search of your Steam directory (without stopping HLDJ) for the file "voice_input.wav" - does it show up, and if so, where?
This may not help...
5) Does voice normally work for you? If not, or you do not have a mic, have you remembered to set up any applicable options in your operating system and/or the game? *
Yes it does.

Here's what is happening , everything is loading correctly and once I press the Play-key there are only 2 sounds that plays correctly and the sound is awful.
Also , the sample is working.

Everything is in 11025 Hz 16 bit mono and only 3 sounds over 10 works.

You probably made an error with conversion somewhere. Have you tried using HLDJ's built-in converter?

No I didn't let me try this , I'll post back if something is wrong again.

Oh wow , it actualy worked but sound quality is still awful... What can I do for the best sound quality ?

Unfortunately, since the source engine only lets you play .wav files through it, quality is rather limited. I'm not a professional in this sorta stuff, but you might be able to get more if you played with it in audacity (or some other similar program). Just make sure you keep the versions that work.