//this is code which emulates a tb303 it is not written by me but i found it on the sc-users mailing list.
//it is missing some features as accent and portamento which are actually important for the 303 sound ...
//the tb303 has the portamento at the end of the node, towards the next node in a fixed time.

(
//s =  Server .internal;
s.boot;
)

(
 SynthDef ( "sc303" , {  arg  out=0, freq=440, wave=0, ctf=100, res=0.2,
		sus=0, dec=1.0, env=1000, gate=0, vol=0.2;
	 var  filEnv, volEnv, waves;

	 // can't use adsr with exp curve???
	 //volEnv = EnvGen.ar(Env.adsr(1, 0, 1, dec, vol, 'exp'), In.kr(bus));
	volEnv =  EnvGen .ar( Env .new([10e-10, 1, 1, 10e-10], [0.01, sus, dec],  'exp' ), gate);
	filEnv =  EnvGen .ar( Env .new([10e-10, 1, 10e-10], [0.01, dec],  'exp' ), gate);

	waves = [ Saw .ar(freq, volEnv),  Pulse .ar(freq, 0.5, volEnv)];

	 Out .ar(out,  RLPF .ar(  Select .ar(wave, waves), ctf + (filEnv * env), res).dup * vol);
}).send(s);

)

 /*
s.sendMsg("s_new", "sc303", 3000, 0, 0);
s.sendMsg("n_set", 3000, 'gate', 1, 'freq', 220);
s.sendMsg("n_set", 3000, 'gate', 0);
s.sendMsg("n_set", 3000, 'dec', 1);

s.sendMsg("n_free", ~node)
*/


 // make GUI!
(
~bpm = 140;
~step = 0;
	 // set default note ons
~defaultNoteOns =  Array .fill(16,1);
	 // this is the note on array that will be used in the sequencer routine
~noteOns = ~defaultNoteOns;

	 // set root
~root = 36;

	 // set default pitches
~defaultPitches = [ 0, 12, 0, 0, -12, 0, 0, 0, -12, 0, 12, 0, 3, -5, 2, 0 ];
	 // this is the pitch array that will be used in the sequencer routine
~pitches = ~defaultPitches;

~tStepLED =  Array .new; 	 // the step indicator LEDs as an array
~sNoteOn =  Array .new;  	 // the note-on sliders as an array
~tNoteOn =  Array .new;	 // the note-on value boxes as an array
~sPitch =  Array .new;	 // the pitch sliders as an array
~tPitch =  Array .new; 	 // the pitch value boxes as an array

w =  Window ( "-303" ,  Rect (128, 64, 510, 320));
w.view.background =  Color .white;
w.front;

~layoutLeft =  CompositeView (w,  Rect (0, 0, 400, 320));	 // make the left pane of the window
~layoutLeft.decorator =  FlowLayout (~layoutLeft.bounds);  // auto-arrange the elements
~layoutRight =  CompositeView (w,  Rect (400, 0, 400, 120));
~layoutRight.decorator =  FlowLayout (~layoutRight.bounds);

 // make transport controls

	 // Tempo
 StaticText (~layoutRight,  Rect (0,0, 45, 14)).string_( "BPM: " );
~tBpm =  NumberBox (~layoutRight,  Rect (0,0, 45, 14))
	.string_(~bpm)
	.action_({  arg  item;
		~bpm = item.value;
		~sBpm.value_((~bpm-40)/200);
	});

~layoutRight.decorator.nextLine;
~sBpm =  Slider (~layoutRight,  Rect (0,0, 100, 20))
	.background_( Color .new(0.8,0.8,0.8))
	.value_((~bpm-40)/200)
	.action_({  arg  sldr;
		~bpm = ((sldr.value)*200) + 40;
		~tBpm.string_(~bpm);
	});

~layoutRight.decorator.nextLine;

	 // Reset
 Button (~layoutRight,  Rect (0,0,45,20))
	.states_([[ "|<" ]])
	.action_({  arg  item;
		~tStepLED[~step].background_( Color .new(0.6,0,0));
		~step = 0;
		~tStepLED[0].background_( Color .new(1,0,0));
	});

	 // Play/Pause
 Button (~layoutRight,  Rect (0,0,45,20))
	.states_([[ ">" ],[ "||" ]])
	.action_({  arg  item;
		if( item.value == 0, {
			~seqr.stop;
		},{
			~seqr.reset;
			~seqr.play;
		});
	});

~layoutRight.decorator.nextLine;

	 // Root note
 StaticText (~layoutRight,  Rect (0,0, 45, 14)).string_( "Root: " );
~tRoot =  StaticText (~layoutRight,  Rect (0,0, 45, 14)).string_(~root);
~layoutRight.decorator.nextLine;
 Slider (~layoutRight,  Rect (0,0, 100, 20))
	.background_( Color .new(0.8,0.8,0.8))
	.value_((~root-24)/36)
	.step_(1/48)
	.action_({  arg  sldr;
		~root = ((sldr.value)*36) + 24;
		~tRoot.string_(~root);
	});


 // make synth control labels
 StaticText (~layoutLeft,  Rect (0,0, 45, 14)).string_( "Wave" );
 StaticText (~layoutLeft,  Rect (0,0, 80, 14)).string_( "Cutoff" );
 StaticText (~layoutLeft,  Rect (0,0, 80, 14)).string_( "Resonance" );
 StaticText (~layoutLeft,  Rect (0,0, 80, 14)).string_( "Decay" );
 StaticText (~layoutLeft,  Rect (0,0, 80, 14)).string_( "Envelope" );
~layoutLeft.decorator.nextLine;

 // make the synth controls
	 // wave-type
 Button (~layoutLeft,  Rect (0,0,45,20))
	.states_([[ "Saw" ],[ "Square" ]])
	.action_({  arg  item;
		s.sendMsg( "n_set" , ~node,  'wave' , item.value);
	});
	 // cut-off frequency
 Slider (~layoutLeft,  Rect (0,0, 80, 20))
	.background_( Color .new(0.8,0.8,0.8))
	.action_({  arg  sldr;
		s.sendMsg( "n_set" , ~node,  'ctf' , ((sldr.value)*(10000-50))+50);  // modify synth param
	});

	 // resonance amt
 Slider (~layoutLeft,  Rect (0,0, 80, 20))
	.background_( Color .new(0.8,0.8,0.8))
	.action_({  arg  sldr;
		s.sendMsg( "n_set" , ~node,  'res' , (1-sldr.value)*(0.97)+0.03);  // modify synth param
	});

	 // decay amt
 Slider (~layoutLeft,  Rect (0,0, 80, 20))
	.background_( Color .new(0.8,0.8,0.8))
	.action_({  arg  sldr;
		s.sendMsg( "n_set" , ~node,  'dec' , (sldr.value)*2);  // modify synth param
	});

	 // envelope amt
 Slider (~layoutLeft,  Rect (0,0, 80, 20))
	.background_( Color .new(0.8,0.8,0.8))
	.action_({  arg  sldr;
		s.sendMsg( "n_set" , ~node,  'env' , (sldr.value)*10000);  // modify synth param
	});

~layoutLeft.decorator.nextLine;

	 // make step LEDs
16.do({  arg  i;
	~tStepLED = ~tStepLED.add(
		 StaticText (~layoutLeft,  Rect (0,0,20,12))
			.background_( Color .new(0.6,0,0))
			.stringColor_( Color .white)
			.string_(i+1)
	);
});
~tStepLED[~step].background_( Color .new(1,0,0));
~layoutLeft.decorator.nextLine;

	 // make the note-on sliders
16.do({  arg  i;
	~sNoteOn = ~sNoteOn.add(
		 Slider (~layoutLeft,  Rect (0,0,20,60))			 // position doesn't matter; width, height do
			.background_( Color .new(0,0,0.7))		 // color the slider
			.step_(0.1)						 // values are stepped by 0.1
			.value_(~noteOns[i])				 // assign it its value from the note on array
			.action_({  arg  sldr;				 // when the slider is moved...
				~noteOns[i] = sldr.value;		 // ... update note-on array
				~tNoteOn[i].string = sldr.value;  // ... update its value box
					 // ...change color of value box
				~tNoteOn[i].background =  Color .new((1-~noteOns[i]),1,(1-~noteOns[i]));
			})
	);
});
~layoutLeft.decorator.nextLine;

	 // make the note-on value boxes
16.do({  arg  i;
	~tNoteOn = ~tNoteOn.add(
		 StaticText (~layoutLeft,  Rect (0,0,20,20))
			.background_( Color .new((1-~noteOns[i]),1,(1-~noteOns[i])))
			.string_(~sNoteOn[i].value)
			.align_(0)
			.action_({  arg  text;
				text.string.postln;
			})
	);
});
~layoutLeft.decorator.nextLine;

	 // make the pitch sliders
16.do({  arg  i;
	~sPitch = ~sPitch.add(
		 Slider (~layoutLeft,  Rect (0,0,20,120))
			.value_((~pitches[i]+12)/24)
			.step_(1/24)
			.background_( Color .new(0.8,0.8,0.8))
			.action_({  arg  item;
				~pitches[i] = ((item.value * 24)-12);
				~tPitch[i].string = ((item.value * 24)-12);
			})
	);
});
~layoutLeft.decorator.nextLine;

	 // make the pitch value boxes
16.do({  arg  i;
	~tPitch = ~tPitch.add(
		 StaticText (~layoutLeft,  Rect (0,0,20,20))
			.background_( Color .white)
			.string_(~pitches[i].value)
			.align_(0)
	);
});
 /*~tempButt = Button(w, Rect(0,0,60,60))
			.states_([
				["0", Color.red, Color.black]
			]);*/

)

 // do other stuff

(
~node = s.nextNodeID;

 // start the synth
s.sendMsg( "s_new" ,  "sc303" , ~node, 1, 1);

 // make the step sequencer
~seqr =  Routine .new({
	loop({

			 // turn on LED
		{~tStepLED[~step].background_( Color .new(1,0,0));  /*(~step.asString + "on").postln;*/ }.defer;

		if(~noteOns[~step].coin, {
			 // play note!
				 // this is out of sync

  //
			s.sendMsg("n_set", ~node, 'gate', 1, 'freq', (~pitches[~step]+~root).midicps);

			//
			(7.5/~bpm).wait;

			//
			s.sendMsg("n_set", ~node, 'gate', 0);

			//
			(7.5/~bpm).wait;

			// buffer playback on server (adds start/stop delay, but better inter-note timing)
			//s.sendBundle(s.latency, [ "n_set" , ~node,  'gate' , 1,  'freq' , (~pitches[~step]+~root).midicps]);
			//(7.5/~bpm).wait;
			//s.sendBundle(s.latency, [ "n_set" , ~node,  'gate' , 0]);
			//(7.5/~bpm).wait;
		},{
				 // it's a rest
			(15/~bpm).wait;
		});

			 // turn off LED
		{~tStepLED[(~step-1)%16].background_( Color .new(0.6,0,0));  /*(((~step-1)%16).asString + "off").postln;*/ }.defer;

		~step = (~step + 1)%16;

	});
});
)

~seqr.play;
~seqr.stop;
~seqr.reset;
~pitches