[sdiy] MIDI Switch

[Andre Majorel]

On 2002-03-15 11:01 -0800, Moho Disco wrote:

> I want to make a little box with
> a 3-way switch on it that changes
> incoming midi on channel 1 to 
> channels 1, 2, or 3.  I'd like to
> do it with only one MIDI in and
> one MIDI out.  I don't want to
> make a switcher with 3 outs.
> 
> Do you guys think this would be
> hard to make?  And would I have
> to program an eeprom or something
> to accomplish this?

Doesn't look too hard. I guess you would need an UART and a
microcontroller that runs a code somewhat like this one :

  int chin  = 0;
  int chout = 1;
  for (;;)
  {
    unsigned char b = getc (midi_in);
    if ((b & 0x80) && b < 0xf0 && (b & 0x0f) == chin)
      b = (b & 0xf0) | chout;
    putc (b, midi_out);
  }

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>
std::disclaimer ("Not speaking for my employer");