Polyphonic Analog Synth Controller Based on GR-300

Here is a possible configuration for a polyphonic analog synth controller using the GR-300. This is a truly MONSTROUS amount of circuitry.
  +-----------------------------+
  |            GR-300           |
  |   Env Flwr       Period CV  |                                      
  |  1 2 3 4 5 6    1 2 3 4 5 6 |
  +--+-+-+-+-+-+----+-+-+-+-+-+-+
     | | | | | |    | | | | | |
    1|1|2|2|3|4|    |1|2|2|3|3|  <--DB50 pins (see Interconnection Wiring)
    1|7|3|9|5|1|   9|5|1|7|3|9|
     | | | | | |    | | | | | |
     | | | | | |    | | | | | |
     O-|-|-|-|-|----|-|-|-|-|-|--------------->
     | O-|-|-|-|----|-|-|-|-|-|--------------->
     | | O-|-|-|----|-|-|-|-|-|--------------->
     | | | O-|-|----|-|-|-|-|-|--------------->
     | | | | O-|----|-|-|-|-|-|--------------->
     | | | | | O----|-|-|-|-|-|--------------->
     | | | | | |    | | | | | |
     | | | | | |    | | | | | |     
     | | | | | |    | | | | | |   6 Env/Gate   6 ADSR's
     | | | | | |    | | | | | |   Converters
     | | | | | |    | | | | | |     +---+      +---+      
     +-|-|-|-|-|----|-|-|-|-|-|---->| 1 |----->| 1 |----->
       +-|-|-|-|----|-|-|-|-|-|---->| 2 |----->| 2 |----->
         +-|-|-|----|-|-|-|-|-|---->| 3 |----->| 3 |----->
           +-|-|----|-|-|-|-|-|---->| 4 |----->| 4 |----->
             +-|----|-|-|-|-|-|---->| 5 |----->| 5 |----->
               +----|-|-|-|-|-|---->| 6 |----->| 6 |----->
                    | | | | | |     +---+      +---+      
                    | | | | | |       
                    | | | | | |       
                    | | | | | |     6 Log 
                    | | | | | |     Converters
                    | | | | | |     +---+
                    +-|-|-|-|-|---->| 1 |----->
                      +-|-|-|-|---->| 2 |----->
                        +-|-|-|---->| 3 |----->
                          +-|-|---->| 4 |----->
                            +-|---->| 5 |----->
                              +---->| 6 |----->
                                    +---+