Problems with SMF1 MIDI files

Some elder YAMAHA-keyboards interprete MIDI-events only of tracks of SMF1-Midi-files with numbers less or equal 16. If we have some notes in track 17 on channel 1 for example, these can be heard with sequencer-software on the PC, even if we use the keyboard to play the notes with a MIDI-OUT-Connection. Playing the song on the keyboard, we don't get any sound from track 17. The problem is repaired with new keyboard models.

After converting the song with my program PSRUTI to SMF0, we get a correct sound with the keyboard also for elder models.

Example: