FastBikerBoy
I beg to differ Karyn but the diamonds displayed in the PRV 'regular' view note pane (not drum map 'stood up' triangles) are definitely present for hardware drum synths.
For a hardware drum synth, the midi data is simply being output through a hardware midi port rather than an internal virtual midi port. Sonah doesn't know or care what is attached or where the midi data is going, it just sends it.
This is where the drum map comes in. Not only does it define the instrument/note names and the midi note that is output for any played midi note in the track, but each instrument/note can also go to a defined midi output. So you could have the whole drum kit being played by SessionDrummer except the snare, played by BFD, and the kick played by an external hardware drum machine.
The instrument definitions are simply preloaded maps with all the correct settings for the particular instrument you selected.