Run 8 External Engine Sound Weird!?

[meeshu]

This is with reference to this sound file - mattfsounds.zip which is available from the File Library.

Specifically, there seems to be a problem with the *.sms for a particular railroad.

The issue seems to be with the sms - D944CW_UPeng.sms which is found within the MC_AC44V3 sub-folder.

When locomotives using this sms file are throttled up, initially the engine sounds seem to be fine up to around run 4. But when throttling up further to run 8, the engine sound changes to a slow and low volume almost chugging sound which is NOT right. Other locomotive engine sounds using similar sms files seem to be fine!

The run 8 wav file associated with the sms file seems to be OK (I checked the wav file in an audio editor). So the issue is with the sms file itself. I've run sms checker and corrected the errors, but I can't see why run 8 sound is not playing back properly when running an activity!?

Open Rails log file attached, but is not really useful here I believe.

OpenRailsLog.zip

[meeshu]

This was a tricky problem to solve!

I have just now figured out what was wrong. The sms file was playing the run 8 wav file at only half its frequency!?

The wave file frequency is 22050 Hz. The sms file was playing this wav file at around 11000 Hz for whatever reason(s). So the wav sound on play back sounded a much lower frequency than it should.

I've corrected the sms file so that it plays the wav file at 22050 Hz, and I've made minor corrections to the volume settings as well.

The locomotive engine sounds now as it should on run 8.

Issue resolved!