Adding engine noise to the map/nav screen?

[Halcyon]

If you minimize the 3D window, the map/nav screen is completely silent. I'm looking to add the default engine hum noise, but I can't find which file governs that behavior.

I found something close, in the controllers.ini file, which has stuff like this:

[Interface] "FFG" 12
[BitmapName] "FFG_US.jpg"
[DLL] "Bridge.DLL" "X000Y000.bmp" 569 408
;/// soundEngineHum sndtype (none = 0, full=1, full no os =2, muted=3, muted no ownship=4)	truthmode
[DLLSOUND] 1 0 0
[DLL] "AcousticDisp.DLL" "X035Y000.bmp" 570 409
[DLL] "ASTAC.DLL" "X000Y035.bmp" 571 410 
[DLL] "Active.DLL" "x035y035.bmp" 572 411
[Nav] "X000Y175.bmp" 416
[DLL] "TowedArray.DLL" "x035y070.bmp" 573 413
[DLL] "EW.DLL" "X000Y070.bmp" 574 412
[DLL] "Radar.DLL" "X035Y105.bmp"  575 415
[DLL] "TMA.DLL" "X000Y105.bmp" 576 414 
[DLL] "WeaponsControl.DLL" "x035y140.bmp" 577 417
[DLL] "FloatingCamera.dll" "NOLINK"
[DLLPOPUP] 1 0 0 285 230
[DLL] "TorpedoControl.DLL" "x000y140.bmp" 578 418
[DLL] "MachineGun.DLL" "x035y175.bmp" 579 419
;/// soundEngineHum sndtype (none = 0, full=1, full no os =2, muted=3, muted no ownship=4)	truthmode
[DLLSOUND] 1 2 1
[TEXTDLL] "Text" 
[RECO] "VoiceReco.DLL"
[Color] "255,140,0"
[Color] "25,30,50"
[Color] "40,50,75"
[Color] "0,255,0"
[Color] "145,75,0"
[Color] "115,105,105"
[Color] "255,140,0"
[Color] "255,140,0"
[Color] "0,255,0"
[Color] "80,80,80"
[Color] "255,255,220"
[Color] "0,0,0"
[Units] "0"
[MenuImage] "FFG7_menu.bmp"
[MenuPos] "-9.3,0.3,-99.0"
[END]

The issue is I'm not even sure this is what is telling which station plays which sound file (for example, the Perry Frigate Bridge playing the engine hum vs the Bridge wings or the external station where the machine gun is playing the "outside" engine noise).

If it is, I'm having trouble interpreting what the numbers in the [DLLSOUND] tag are referring to.

Anyone have any ideas about this?