title: Midi Force Channel JSFX
tags: reaper jsfx midi

These two scripts present a single slider to force the midi channel.
The point here is that you can then put the slider as a knob on the track control
panel to allow you to easily select which midi channel the track outputs to.
Then you can send midi all->all and the receiving channel will get midi on that
channel (useful for multi-timbral instruments like Ostirus, Kontakt, or Falcon).
Or you can send n→m to pick out individual sends.

The second script simply limits the slider to values 1..4, to reduce the granularity
of the knob.

# rechannel_jda
```
desc: Midi Rechannel JDA
//tags: MIDI processing filter
//author: John Allsup

// will cause stuck notes if slider is moved while
// notes are playing

slider1:1<1,16,1>Target Channel (1..16)

in_pin:none
out_pin:none

@init

@block

while(
  input = midirecv(ts, m1, m2, m3) ?
  (
    s = m1 & 0xF0;
    c = m1 & 0x0F;
    ( s != 0xF0 ) ? (
      m1 = s | (slider1 - 1); 
      midisend(ts,m1,m2,m3);
    ) : (
      midisend(ts,m1,m2,m3);
    );
  );
);
```

# rechannel4_jda
```
desc: Midi Rechannel JDA (4 chan)
//tags: MIDI processing filter
//author: John Allsup

// will cause stuck notes if slider is moved while
// notes are playing

slider1:1<1,4,1>Target Channel (1..4)

in_pin:none
out_pin:none

@init

@block

while(
  input = midirecv(ts, m1, m2, m3) ?
  (
    s = m1 & 0xF0;
    c = m1 & 0x0F;
    ( s != 0xF0 ) ? (
      m1 = s | (slider1 - 1); 
      midisend(ts,m1,m2,m3);
    ) : (
      midisend(ts,m1,m2,m3);
    );
  );
);
```