Check the User Manual for your Roland, typically towards the last pages there will be a listing of all voices and what MIDI channels they are assigned to work on.

Most MIDI synths that use GM (or GM2) mode put the Percussion Bank on MIDI ch. 10 but not all. Some still use the older ch. 16 standard. Others may use a different channel as well.

**Also check the BiaB song you are using. If the Drums trackname is in Green, signifying that RealDrums are invoked for that particular songfile, you will not hear any MIDI drums by design. Turning off the RealDrums in the RealDrums control panel such that the Drums trackname turns Yellow, signifying MIDI drums are being invoked is in order. **


--Mac