I have an issue where at the beginning of exported files, and whenever I FIRST play a song after opening LMMS, there's a pop right as it begins playing. I know it's not a problem with the instruments because that same pop is only heard at the beginning of a track, and only after being exported or the first time it's played after opening the file. Is there some sort of setting that can fix this?
I know what causes this: Effects suddenly kicking in. Not sure how to stop it though.
Go to settings and ensure "Keep effects running without input" is turned ON, then restart.
A way to avoid this problem, could be to move your entire song ahead by one bar (using select mode on song editor, and moving it forward). It might not stop it completely, but it will attenuate it.