I have a commercial MIDI file which has too fast tempo so I'd like to change its tempo using Rosegarden. Unfortunately when I export that MIDI file from Rosegarden it adds a strong reverb to the music making it practically non audible. It's enough to import that MIDI file to Rosegarden and export it without any changes and the resulting MIDI file has that reverb. The problem concerns that particular file because Rosegarden is able to export properly the other MIDI files including the files bought in the same MIDI store. I tried to get rid of that reverb but I didn't find the solution.

Because it's commercial MIDI file which I bought in a MIDI store I can't put it in the Internet to allow you test it but if you'd e-mail to me I'll send it to you asking you to not put that file in the Internet.