simpler and correct way of enumerating jack metadata port order

engine/main.py

@@ -137,23 +137,19 @@ class Data(TemplateData):
         highestLibId = max(self.libraries.keys())
         highestInstrId = max(instId for libId, instId in Instrument.allInstruments.keys())
 
-        s = set()
-
         clientName = cbox.JackIO.status().client_name
         order = {}
+        orderCounter = 0
         for (libraryId, instrumentId), instr in Instrument.allInstruments.items():
             L = clientName  + ":" + instr.midiInputPortName + "_L"
             R = clientName  + ":" + instr.midiInputPortName + "_R"
-            lnum = highestLibId * libraryId + instrumentId * 3  # * 3 to make room for stereo pairs and midi. #TODO: If we get non-stereo pairs this must be solved
-            assert not lnum in s, lnum
-            assert not lnum+1 in s, lnum+1
-            assert not lnum+2 in s, lnum+2
-            s.add(lnum)
-            s.add(lnum+1)
-            s.add(lnum+2)
-            order[L] = (lnum, instr)
-            order[R] = (lnum+1, instr)
-            order[clientName  + ":" + instr.midiInputPortName] = (lnum+2, instr)  #midi port
+
+            order[L] = (orderCounter, instr)
+            orderCounter += 1
+            order[R] = (orderCounter, instr)
+            orderCounter += 1
+            order[clientName  + ":" + instr.midiInputPortName] = (orderCounter, instr)  #midi port
+            orderCounter +=1
 
         self._cachedJackMedataPortOrder = order