Unexplicable volume decrease in the middle of the song after Export

Hello, All!

I have Windows 10 and Audacity 2.3.3

I have one song, which is a multi-track audio project

My problem is: I have noticed a subtle but hearable volume decrease after exporting all the tracks into one audio (the problem is always there for different audio formats: .wav, .ogg, .mp3)

This decrease starts in one random point inside the song

If I hear the song inside Audacity, there is no decrease at all!

But, after export, hearing the exported file I clearly notice this decrease in the volume starting from a certain point: the volume is normal and steady before it; after it, it decreases and then remains steady again

(In another song, I had the same problem, but I was able to remove the volume decrease, since I had found it was linked to clipping: I had removed the clipping and exported again, and the exported file now showed no volume-decrease. But the current song has no clipping whatsoever…)

I need to make a music demo out of this song, so for me it is very important that it will have the best quality/consistency possible!

Any ideas about reason(s) for this unexplicable volume decrease to happen?

Thank you very much!

Perhaps the software that you are playing the file with is automatically adjusting the playback level.

You are right, the problem was the player… I was using MPC-HC… I have tried with another one (VLC) and the problem actually disappeared! I should have tried from the beginning more than one player, but I didn’t think to that because -before now- MPC-HC had never given me any problem…

Thank you, Steve!