Monophonic Analog Synth Controller Based on GR-300

Here is a possible configuration of a fully functional monophonic synth controller using the GR-300:
  +-----------------------------+
  |            GR-300           |
  |   Env Flwr       Period CV  |                                      
  |  1 2 3 4 5 6    1 2 3 4 5 6 |
  +--+-+-+-+-+-+----+-+-+-+-+-+-+
     | | | | | |    | | | | | |
    1|1|2|2|3|4|   9|1|2|2|3|3|  <--DB50 pins (see Interconnection Wiring)
    1|7|3|9|5|1|    |5|1|7|3|9|
     | | | | | |    | | | | | |
     | | | | | |    | | | | | |
     | | | | | |    | | | | | |       Analog
     | | | | | |    | | | | | |    Multiplexers
     | | | | | |    | | | | | |     +--------+
     O-|-|-|-|-|----|-|-|-|-|-|---->| Env    +----O-----------> Env Out
     | O-|-|-|-|----|-|-|-|-|-|---->| Select |    |
     | | O-|-|-|----|-|-|-|-|-|---->|        |    V
     | | | O-|-|----|-|-|-|-|-|---->|        |  +-----------+
     | | | | O-|----|-|-|-|-|-|---->|        |  | Env/Gate  +-> Gate Out
     | | | | | O----|-|-|-|-|-|---->|        |  | Converter |
     | | | | | |    | | | | | |     +--------+  +-----------+
     | | | | | |    | | | | | |     | Period |  
     | | | | | |    +-|-|-|-|-|---->| CV     |  +-----------+
     | | | | | |      +-|-|-|-|---->| Select |->| Log       +-> 1 V/Oct
     | | | | | |        +-|-|-|---->|        |  | Converter |   Out
     | | | | | |          +-|-|---->|        |  +-----------+    
     | | | | | |            +-|---->|        |     A
     | | | | | |              +---->|        |     |
     | | | | | |                    +--------+     |
     | | | | | |  +-----------+     | Trans- |     |
     | | | | | |  | Transpose +---->|  pose  +-----+
     | | | | | |  | Voltages  +---->| Volt-  |
     | | | | | |  |(See Log   +---->|  age   |
     | | | | | |  | Converter)+---->| Select |
     | | | | | |  |           +---->|        |
     | | | | | |  |           +---->|        |
     | | | | | |  +-----------+     +--------+
     | | | | | |                      A A A
     V V V V V V                      | | |
  +--------------+                    | | |
  |   Loudest    +--------------------+ | |
  |   String     +----------------------+ |
  |   Priority   +------------------------+
  +--------------+    Control lines