Thank you, it actually works :), I did a quick test on a 37026, with the 3.2.2.0 firmware. added a few sounds and programmed it. after I had programmed and tested it, I updated the locomotive with the latest firmware (3.2.2.1) and did a decoder reset and the extra sounds stayed.

Do you have the link to the discussion on stummiforum?

I think the key here is using the mDecoderTool3 and programing the decoder through the CS3, and on a decoder with a fairly recent upgraded firmware.
I have previously tested the mDecoderTool3 and the USB stick a few times, but it has never worked. And I have also previously programmed mSD3 decoders through the cs3, but I never tried it with factory-installed decoders.

Could this be a software "bug" from Marklin, that will be "corrected" later ?
I Have noticed with mSD3 and current software/firmware that dere is some bugs in decoder settings eg motor type of ofter programmed wrong, and when a decoder project is read back on mDecoderTool3, eg after a calibration, a lot of the values are wrong.
This was also the case with 37026 today, after the programming, the CS3 reported back that the motor was set to the wrong type.

Hi Jean

I discovered that it probably has to be the designated decoder project for the locomotive, in order to work, other projects does not seem to work.

E.G. I tried to update on a special BR 212 (37000.001), and non of the standard projects did work, I tried several.

but then I discovered that the 37000.001 decoder project was available in mDecoder Tool, (hidden away under the W0 folder).

And with the correct project, I was able to add sounds and update the locomotive without any problem.

Edited by user 24 August 2021 11:32:09(UTC)  | Reason: Not specified

An update.

Discovered a few things: (this for information)

It seems that at least firmware 3.2.0.0 is required

in this case, there is no firmware update from Märklin. (39030 with decoder part no 236805)

with a different locomotive I discovered this:(this for information)
There are a few locomotives that have 32 Mbit decoders. eg my 37588 G12, with decoder part no 259851. (Firmware 3.2.2.0)
but the mDecodertool does not recognize this. So it's possible to send projects that are bigger to the decoder, and that messes up the sound badly.
I think programming starts again and rewrites from the start when it reaches the 32 Mbit limit.

the fix was just to reduce the project under the 32 Mbit limit and program again.
The 32 Mbit limits the sound so it was only space for a few more sounds. But I did also remap the decoder a bit and added a telex coupler waltz with sound.

(For information i'm using mDecoderTool v3.4.2, and a CS3+ with software v.2.3.1 (8))

Edited by user 30 August 2021 23:52:22(UTC)  | Reason: Clarification after some complaints, Clarifications in bold

The above are two different locomotives. (edited for clarification)

the 37558 has the original factory fitted decoder and it updates like the rest of the decoders. but don't know if it was used in all the 37588.
I would guess it's an mSD3 since it has firmware 3.x.x.x and clapcott has it on his list as an msd3 in this thread

I also got a 37144 T3 from around 2015 with mfx+, but that one has decoder firmware 2.17.19, I did upgrade it from an earlier 2.x.x version, on the CS3. and I assume this is an msd.

Hi, I might have been unclear in my post.

My post above was intended for information to others, that in order to do a sound upgrade, firmware v3.2.0.0 or higher is required on factory-installed decoders.
This since it had not been mentioned at the time of posting.

In my example, I also wrote that Märklin had not released a firmware update for that decoder that triggered the message. (39030 with decoder part no 236805). You probably have the same locomotive as there is no 39039?

I haven't seen any firmware v3.2.5, the latest seems to be. 3.2.2.2, depending a bit on the type of decoder. (in most cases 3.2.2.1)

Hi
I agree that my post could have included more information, and I do apologize for any confusion.
I have tried to correct that. (note that I did not ask any questions)

Please remember that not all are native English speaking and that sometimes the intention is lost during translations. I do know that I probably sometimes also can be a bit direct, as a result of that English is not my birth language. But when I write, I try to read over and rephrase things so I don’t accidentally insult people.
What I was trying to do here was only to share some more information about factory fitted decoders and sound updates. This because there is no information from Märklin about this. I do really appreciate the information “JohnjeanB” shared about this and was only trying to add to that information, in order to give a more complete picture.
I hope others also can share their experience with this and especially if there are things to avoid.