No sound when coasting in TFO. No documentation in the Point section for TFOXML

[ginga81]

Description

When I moved the TFO as shown in the video, I could hear the motor noise when accelerating and decelerating, but the noise became strange when coasting.

TFOtest.zip

I copied the exact same sample files,Train.dat, run1.wav, sound.cfg and train.dat, and added dummy Extensions.cfg and car.csv.
However, this only produced the sound I wanted and I was unable to reproduce the video.
The only differences are that I added animated, bogie and their animations to extensions.cfg, and the csv is for the E5+E6 Shinkansen.
I had no idea why this made a difference, so I filed an issue.
I wasn't sure if this was because I was passing through at high speed or because I was using the Point section, so I tried to look into it and found that there was no documentation for the Point section.
Even when I slow down the speed, there is no sound, as shown in the video, and strange noises occur.

TFOtest.mp4

Reproduction

You can reproduce this by changing the TFO in the sample route to the TFO included in the Tohoku Shinkansen beta version.
E5+E6 are accessed from the E5 and E6 folders, so copy the three folders E5, E6, and E5+E6.

Tohoku Shinkansen Beta Version
https://drive.usercontent.google.com/download?id=1zgAhjdSW3L7ZxM2NWKOg9YFyDgP8DVES&export=download&authuser=0

Although I haven't used it yet, TFO trains are here under
Railway/Object/Tohoku-Shinkansen-Objects/Tohoku-TFO

Route

Use sample route and Tohoku Shinkansen beta2.

Train

any

Logs

This issue don't crash. So, no log.

Related information

My PC's spec:
OS:Ubuntu24.04LTS
CPU:AMD Ryzen 9 9900X 12-Core Processor
Memory: DDR5 32GB single channel
Graphic:Radeon RX 9060 XT Challenger 16GB OC
Driver:AMD Radeon Graphics (radeonsi, gfx1200, LLVM 20.1.2, DRM 3.61, 6.14.0-37-generic)

[leezer3]

If changing for a dummy extensions.cfg fixes things, I strongly suspect this may well not reproduce easily for me- This suggests it's performance related, and the external is tipping things over the edge between what's stable and what isn't.

Will try and take a proper look over the next few days, but there should be no difference between the dummy external and a full animated one with regards to the run sounds.
If the animated file is using any sounds, this is handled differently internally, but the run sounds have nothing to do with the animations.

[leezer3]

OK, easier than I thought-
The build from today will help with this (solves the glitching sound).

Essentially, this was being caused by the fact that the TFO model sets the speed directly each frame, rather than by running it through the traction modelling.
This was causing an issue when the speed was constant- The TFO set the speed each frame, and the rolling physics then dropped it fractionally, triggering the motor sound to play.

What this doesn't do however, is to play any motor sound when coasting- When coasting, the TFO's acceleration is (essentially) zero, and so it doesn't play anything.
Need to think a bit more about exactly how to solve that problem.

[ginga81]

I checked out today's build.
The popping noise when coasting has disappeared.