Thanks for your reply.
I'm Japanese, I'm sorry if I'm not good at English.
It is a track bouncing function.
Export master by specifying a range.
Even though you are doing exactly the same operation, it may be exported normally or it may fade out in the middle.
It has never occurred in previous versions of samplitude.
These days I call and check the file every time I export the master.
I'd really like to contact MAGIX directly, but I can't because I don't understand how to do it.
Thank you so much for dealing with me.