tags: jsfx

This allocates notes to the first available channel. This will probably fail if more than 15 simultaneous
notes are played.
```
desc: JDA Midi Mpe Allocator 1

@init
alloc_base = 100; // channel => pitch
alloc_chan = 200; // pitch => channel
alloc_i = 0;

loop(i=0;16,alloc_base[i]=-1;i+=1);
function off(offset,nch,p,v) (
  alloc_chan[p] = 0;
  alloc_base[nch] = -1;
  midisend(offset,0x80|nch,p,v);
);

@block
while(midirecv(offset,m1,m2,m3)) (
  cmd = m1 >> 4;
  ch = m1 & 0xF;
  ( cmd == 0x8 || ( cmd == 90 && m3 == 0 ) ) ? (
    nch = alloc_chan[m2];
    off(offset,nch,m2,( cmd == 0x80 ? v : 0));
  ) : ( cmd == 0x9 ) ? (
    nch = alloc_chan[m2];
    nch > 0 ? (
      off(offset,nch,m2,0);
    );
    fch = 0;
    i=1;
    while(i<15 && fch == 0) (
      ( alloc_base[i] == -1 ) ? ( fch = i; tmx1 = i; );
      i += 1;
    );
    alloc_chan[m2] = fch;
    alloc_base[fch] = m2;
    midisend(offset,0x90|fch,m2,m3);
  ) : (
    midisend(offset,m1,m2,m3); 
  )
);
```