desc:mod_clear :: ccernn.2009 :: v0.0.1
slider1:0<0,63,1>start channel
slider2:1<1,64,1>num channels
@slider
  startchan = slider1;
  numchan = slider2;
@sample
  c = startchan;
  loop( numchan,
    spl(c) = 0;
    c+=1;
  );
