Thanks both of you.
Steindork --- if REAPER, doesn't see a program change, which makes sense, as I created these MIDI using SB GS MIDI 8MB, years ago, using the SB PCI-128. So, I have manually "fooled" the VST player, in a way, to play a Soundfont with different "program" and "bank"
Luckily, I created a "setting" for Drums (channel 10, bank 128, instrument 0), which helps, but is not a true solution.
I will investigate that Thread fo JS programming.
If all fails, I can re-edit the MIDI volumes back in the program I used (Freeware JAZZ++)
So far, I found some Soundfonts "more" realistic compare to MS GM developed by Roland, or VSC VSTi. Maybe this sort of encouraged me to head in that direction.