So, I tested HedOrgan-B3-Presets-V84d.sf3 and I get silence too, but only in the first program, if I change to program 2 or higher, I get sounds. What about you?
Hmm, by checking "HedOrgan-B3-Presets-V84d.txt" I see the 1st program doesn't have a sound indeed, see:
+-----+-----+----------------------+----------------------+
|Bank | PC | Name* | Info. |
+-----+-----+----------------------+----------------------+
| 000 | 000 | 1 [ Theater Upper ] | No Sound, Title Only |
So, in the end, it all seems to work just fine?