Bachman volume CV Required ??

[Shedmaster 47]

Hi folks,

 Happy new year to you all !!    I wondered if anyone out there just happens to know the exact CV  number to adjust to alter the sound settings on a 

 Bachman  class 37/  521

   (  32-394 DS  Colas )  

It's new and just gives you a website to visit to obtain any decoder info from ..!!

    My signals not to hot and it keeps crashing whenever I try !! 

   Plus what's the range I can choose from (  0 through to  255  ) or has it changed in recent years ?

    Many thanks  in advance for any help 

    Yours 

        Allan