hello I have a problem with my sound card on a d830, with clover polyzargone of files to El Capitan I can well settle everything, even the 11.1 update also I use for sound voodoohda 2.8.5 but the sound is bad and sizzles in my opinion it is a codec problem or patch for applehda sigmatel 9205 how do you sound without sizzle could you help me?