MIDI editing in a PC program

[raduelo]

Hello!
I would like to ask you about your advice.
I have a problem. When I am editing some MIDI song in PC program XG works and when I change some voice from piano to drums, for example, it is OK, but when I touch the button to play song from the beginning, piano is back, and there are no change. This problem is only sometimes and sometimes there are another problems, but they are similar-sometimes i change some voices, but there are no changes.... So I want to ask you if you have some advices about it or if you have a good PC program for editing MIDI of yamaha arrangers on PC. Do you edit your MIDI in keyboard or in PC program?? Now I am editing MIDI on my psr s770 but buttons around displey of s770 is stressed and i want to edit midi on pc, because I do not want to damage this buttons by very frequent midi changes and i want to do another midi editing functions.

Thank you very much for any help from you.

Greetins from Czechia, Radek Skalík.