Besides the piano sound of course, the brasses are what I love most about my PX-310. But trying them with Cakewalk Sonar 7, a shock: the instrument's all important trumpet sound is suddenly about 1/6 its normal volume! Going back to playing it manually, that sound works fine again. It simply won't sound forth normally with the MIDI. Sorry, I can't afford to replace the 310 with a later model.
Yes, the other sounds work fine on and off MIDI. And yes the MIDI works fine with all my other keyboards -- been doing so for over 10 years.
Help! Please advise! Don't give me the silent treatment! I have a wonderful Windows 7 Toshiba laptop and use the incredible Roland UM1 MIDI interface, which has always worked flawlessly.