This program kills chuck 1.2.0.4 after u>30, when curbuf and nextbuf references are swapped. There is something blatantly wrong with this code?

// the patch
sndbuf buf => dac;
sndbuf buf2 => dac;
sndbuf @ curbuf;
sndbuf @ nextbuf;

2 => buf.interp;
2 => buf2.interp;
// load the file
"/home/charles/test.wav" => buf.read;
"/home/charles/test.wav" => buf2.read;

// set the playback rate (1.0 is default)
1.0 => buf.play;
1.0 => buf2.play;
buf @=> curbuf;
buf2 @=> nextbuf;

0 =>int u;
buf.samples() => int size;
std.rand2(0, size) =>int nextpos;
100::ms => dur stepping;
nextpos => nextbuf.pos;
0.0 => float mixer;
1.0 => curbuf.gain;
0.0 => nextbuf.gain;
// time loop
sndbuf @ swap;
while( true )
{
    1 +=> u;
    if ( u>30 )
    {
      5::ms => stepping;            
      0.05 +=> mixer;
      1.0 - mixer => curbuf.gain;
      mixer => nextbuf.gain;
      if ( mixer > 0.95 )
      {
        std.rand2(0 , size) => nextpos;
    curbuf => swap;
    nextbuf => curbuf;
    swap => nextbuf;
    nextpos => nextbuf.pos;
    0.0 => mixer;
        0 => u;
    100::ms => stepping;
      }     
    }
    stepping => now;
}

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