Gmod Roundend Music Addon

So I "created" or better enhanced and adjusted an addon to my personal needs. It´s an addon which plays music at the end of an round depending on the result (who won). But I found it kinda frustrating since my friends were complaining that the music was either too loud or too silent  and I adjusted every single song of about 90 or so by hand and they kept complaining. Someone then pointed out that an Interface or just a command or option to adjust the volume would be really nice but I couldn't get my head through anything that would do that.


EDIT:

So I used the "surface.PlaySound ( _sound)  function (in which ( _sound ) is a string as a Random Table depending on the win event.
There was no real way to le the client adjust the volume.
I then found that I could use another "function" to do that but im not sure how to change the code to work with the random table i have..

So what i had before was this:


net.Receive( "_ttt_end_round_music", function( byte, Player )
    local _sound = net.ReadString( );
    surface.PlaySound( _sound );
end )


And now I found this :


local sound = CreateSound( LocalPlayer(), fileName )
sound:PlayEx( volume_0_to_1, pitch_0_to_255 )


What i would now do is this:


net.Receive( "_ttt_end_round_music", function( byte, Player )
    local _sound = net.ReadString( );
    sound.Play( _sound,)
end )


But I'm almost 100% sure this wont work and also I would want it so the client could do something to adjust the volume.
Like a function that calls at the same hook as the play.sound which would bring up a slider to adjust the Volume

Edit2:

I talked to some Dont Starve coder and they came up with this:


net.Receive( "_ttt_end_round_music", function( byte, Player )
    local _sound = net.ReadString( );
    local _audio = CreateSound(Player, _sound)
    _audio:PlayEx( volume_0_to_1, pitch_0_to_255 )
end )

But this gives me this error:


[TTT Round Ending Music] lua/autorun/client/cl_end_round_music.lua:3: Tried to use a NULL entity!
  1. CreateSound - [C]:-1
   2. func - lua/autorun/client/cl_end_round_music.lua:3
    3. unknown - lua/includes/extensions/net.lua:32


Serversided code:


END_OF_ROUND_WIN_DEFAULT_SOUND = "round/sound37.mp3";

if ( SERVER ) then
    util.AddNetworkString( "_ttt_end_round_music" );

    for k, v in pairs( END_OF_ROUND_WIN_INNOCENT_SOUNDS ) do resource.AddFile( "sound/" .. v ); end
    for k, v in pairs( END_OF_ROUND_WIN_TRAITOR_SOUNDS ) do resource.AddFile( "sound/" .. v ); end
    for k, v in pairs( END_OF_ROUND_WIN_TIMELIMIT_SOUNDS ) do resource.AddFile( "sound/" .. v ); end

    local function endofround( wintype )
        // Default sound
        local _sound = END_OF_ROUND_WIN_DEFAULT_SOUND

        if wintype == WIN_INNOCENT then
            _sound = table.Random( END_OF_ROUND_WIN_INNOCENT_SOUNDS );
        elseif wintype == WIN_TRAITOR then
            _sound = table.Random( END_OF_ROUND_WIN_TRAITOR_SOUNDS );
        elseif wintype == WIN_TIMELIMIT then
            _sound = table.Random( END_OF_ROUND_WIN_TIMELIMIT_SOUNDS );
        end

        net.Start( "_ttt_end_round_music" );
            net.WriteString( _sound );
        net.Broadcast( );
    end
    hook.Add( "TTTEndRound", "Handymanendofround", endofround )
end