Frank,

This empty midifile is already present in each style and is called the control changes part. You can access it in OMB by double clicking in the control data column in the stylemaker. This data is sent when a style is activated.

In original Yamaha styles all the bank/patch data is usually in the control changes part and not in the variation parts (mains, fill-ins).

So if you want to use different instruments you could put each instrument in a separate channel. In Yamaha keyboards you can only use channel 9-16. In OMB you can use all channels but of course you would reserve a few for melody.

If you need more then 16 different instruments in the style then you would need to switch bank/patch in a variation now and then. If the delay is mainly caused by the loading of the instrument font from harddisk then you can preload all instruments in the control changes part. Just place the controllers and patches for the different instrument subsequently in the control data of the same track.

Jos