Hey @Gerson_Benjamin_Sobe, this could be related to your project’s global quantization setting. Could you check that your quantization is somewhere between 1/4 and 1 Bar? If the value is too short (e.g. None), you might encounter these strange jumps.
I just released a new beta that replaced fadeIn and fadeOut with a new fadeTo command that allows you to fade the channel to any volume. This also fixes the issue with fade in not working on the main channel