Hi!

The loco has an ESU decoder, but without sound and there is nothing with respect to volume that can be adjusted with an MS2.
Maybe the volume can be adjusted with a soldering iron.
BTW: you can't blame the low volume on ESU.

That's the sound volume for sound decoders. No effect with this loco, no sound decoder.

AFAIK the loco has a Märklin sound module (and IMHO not worth any effort to make it louder).

Hi,

Well no actually !! Those early FX digital Loks, and even some more recent ELoks in particular that have an ESU FX/MFX decoder, with a few sounds like whistles etc are made by separate sound module, supplier unknown ??

However in those earlier FX type decoders, the volume, (and top speed) was usually adjustable by means of a dashpot/s on the decoder board.
Have a look at your instruction manual, if you have it, and it will explain this operation ! Turning the pot clockwise increases the volume
So at least take the body off your E120 and see if it has the small square pots on the decoder board

I have just searched the Marklin Manual (handbook) list, and there is not one for 37528

That said, usually the MFX decoder varieties do have a controller adjustable sound volume.

Ya its 37538 Class 120 its the E120 model it is quick around the layout real fast.
I could always get sound added again to the loco decoder a person i know does loco sound work he might be able to add more sound onto the decoder thats in the loco already seen its ESU or put in a new one with loco sounds and station announcements etc.
I will have to do something as that horn sound is just awful like something a 5 yr old would have on a toy loco.

Hi
What i might do is put a loco horn sound on my loco 37538 that sounds like a loco horn sound and i dont care if its not for a Class 120 if you know what i mean and if thats from a diesel loco so be it i want a good loud horn noise a proper loco sound to feel real for me as the horn noise on my ICE 2 Start set sounds awful to so i might do my DHL Taurus 39833 and 39832 to with a diesel Horn noise to in time also.
Its what suits me it will be my layout look on youtube at a Class 120 37539 and listen to the horn noise it sounds just awful.
One question i see this mentioned alot in relation to digital control where it says in a loco description acceleration and braking delay can be controlled digitally what does this mean in simple english i know its to do with stopping but where do you use it i just turn down the control know to slow n stop and press it down for direction changes whats the great thing about this acceleration and braking delay over that way

So you hit F4 and the loco increases to whatever speed you have it set to it saves you having to manually turn the control knob etc
Im sure if i read my MS2 Manual it will explain how this is done but on a straight test track there is no need i suppose for it i will have to wait until my layout is down to use it.
But i really dont uderstand its benefit as when you come into a station the loco will have to stop and you have avoid other locos so its still manual control unless you put in shuttle routes is it a kind of launch control where the loco gets up to its top pre set speed itself at the press of a button