You're welcome.

What sound engine do you use? SDL?
PM it. You may have to zip it first. If that doesn't work put it somewhere and PM a link.
I think there are export related fixes in the up-coming release, lmms-1.2.2, that could be related to the problems you're seeing. 1.2.2 is being prepared right now. If you can recreate a file that fails to export with the default samples I can test it for you.
Which version of lmms do you use?
@markg I only know lmms unfortunately, otherwise I would have recommended something. All similar software I have come across has a learning curve. In this case the problems you're facing is understanding the envelope generator of a synth, a common tool. This is something you need to work on no matte...
I don't think there is an envelope set up There is. Also it's inverted. Set AMT to full right and turn the HOLD down. Also turn the LFO off. It's not helping here. I think at the core of the issue is the default sound of the tripple oscillator synth. It's three simple sine waves and if you start tw...
It sounds like you have possibly a long decay added to the note. It's hard to judge from the video what is wrong. Out of the box I don't see the same issue. In the second tab in the instrument window you can set the envelope. Try and see if it is on and if so, if turning the hold/decay/release down ...
Yes, that looks like the 'skipped notes issue'. It sounds to me like this is something lmms can't do right now. One thing you can fix though and that's the automation on the time signature. See how it skippes to 2/4 instead of 4/4? Right click the numerator and choose Remove song-global automation ....
Have we discontinued the old supported MAC in 1.2.1?! I'll try and sum up a discussion from Discord/#techtalk. We haven't but Homebrew dropped the older systems. So tresf needs to stitch the old builds together more or less by hand. In the end I don't think this will happen but there could maybe be...
I don't know. I'll ask on discord.