[sdiy] AVRsyn (MIDI channel selector added)

[Jaroslaw Ziembicki]

For those who ordered a PCB of "AVRsyn": there is a new feature -
a MIDI channel selector. You can use either a four-position DIP switch,
a hexadecimal switch or a rotary switch.

The MIDI selector should be connected as follows
(refer to the schematics at
http://www.elby-designs.com/avrsynth/avrsyn-about.htm):

SW1   from J101-28   to J101-33
SW2   from J101-28   to J101-35
SW3   from J101-28   to J101-37
SW4   from J101-28   to J101-39

The following settings are possible:

SW4  SW3  SW2  SW1       MIDI channel

  off      off      off      off         each (OMNI)
  off      off      off      ON       1
  off      off      ON    off         2
  off      off      ON    ON       3
  off      ON    off      off         4
  off      ON    off      ON       5
  off      ON    ON    off         6
  off      ON    ON    ON       7
  ON    off      off      off         8
  ON    off      off      ON       9
  ON    off      ON    off         10
  ON    off      ON    ON       11
  ON    ON    off      off         12
  ON    ON    off      ON       13
  ON    ON    ON    off         14
  ON    ON    ON    ON       15

In case of using a rotary 5-position switch, only
"each", "1", "2", "4", and "8" could be selected.

Regards, Jarek
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