( 
var w, freqnow, a;
var midi_controller, midi_channel;

w = GUIWindow.new("panel", Rect.newBy( 128, 64, 252, 130 ));
a = NumericalView.new( w, Rect.newBy( 64, 36, 64, 20 ), 
"NumericalView", 200, 100, 2000, 1, 'linear');

midi_controller = 64 ;
midi_channel = 16 ;
    
Synth.play({

   arg cynt;

   freqnow = MIDIController.kr(midi_channel,midi_controller,200,1000,'exponential');
   cynt.trepeat(0, 0.1, { a.value = freqnow.poll;});
   SinOsc.ar(freqnow, 0, 0.1)

});
     
w.close;
)