[dj]

Hi, Freddie:

Unfortunately, it has nothing to do with the instrument definition file, rather with the way the architecture of the Tyros is set up.

Most basic General Midi capable instruments default to the drum bank sound set when Channel 10 is selected -- the instrument is capable only of drum sounds on Channel 10.

The Tyros, however, is much more flexible and keeps its options open on Channel 10: it may be that the owner doesn't wish to use that channel for drum sounds. Therefore the drum bank(s) must be explicitly selected.

There may be a GM selection in the Tyros' operating system that will lock Channel 10 onto the drum sounds, though. Check the manual or online for hints.

David