(
//Global sinusoidal envelope simulates passing of the storm
SynthDef (\global, {
	arg uitbus, duur;
	Out.kr(uitbus, EnvGen.kr(Env.sine(duur, 1), doneAction: 2))
}).send(s);
)

//Rain
// metal sound
(
SynthDef (\regen, {
	arg inbus;
	var trig;
	trig=Dust.kr(0.3*In.kr(inbus, 1)); //not to frequent, controlled by global envelope	 
Out.ar(									
	 	0, 
	 	Pan2.ar(				// in, pos, level
	 		SinOsc.ar(
	 			TRand.kr(1000, 2000, trig), //every drop has its own frequency
	 			0, 					//fase
	 			0.7 + (0.5* SinOsc.kr(	//amplitude-modulation
	 						TRand.kr(1000, 2000, trig),
	 						1.5*pi,			//fase
	 						TRand.kr(0.0, 1.0, trig)//varying modulation
	 					))						//end of modulator
	 		),								//end of SinOsc
	 			TRand.kr(-1.0, 1.0, trig),//each drop has its own position in panorama
	 			0.1								//low level, to make room for thunder
	 	)									//end of Pan2
		*EnvGen.kr(
			Env.perc(
				0.01, 						//short attack
				TRand.kr(0.1, 1.0, trig), //each drop has its own eigen decay-time
				1, 							//normal level
				-8							//good curve
			), 								//end of Env
			trig							//start raindrop
		)									//end of EnvGen
	)										//end of Out
}).send(s);
)
//Rain with white noise
(
SynthDef (\regen2, { 
	arg inbus;
	var trig;
	trig=Dust.kr(20*In.kr(inbus, 1)); //many drops, controlled by global envelope
	Out.ar(
		0, 
		Pan2.ar(
			LPF.ar(
				WhiteNoise.ar(0.1), 		//white noise with low level
				LFNoise1.kr(0.5, 200, 2000),//slightly varying sound
				1 								//normal level
			)*									//end of LPF
			EnvGen.kr(
				Env.perc(0.005, 0.005, 1, -8), //short attack and decay
				trig
			),									//end of EnvGen
			TRand.kr(-1.0, 1.0, trig),	//each drop has its own position in panorama
			1									//normal level
		) 										//end of Pan2
	);											//end of Out
}).send(s);
)
//wind
(
SynthDef(\wind, {
	arg inbus;
	var w1, w2;								//two identical functions, one left, one right
	w1=RLPF.ar(
		WhiteNoise.ar(1), 					//normal level, out level comes later
		LFNoise1.kr(0.5, 1000, 1100)*In.kr(inbus, 1) + 20,//filter controlled by global envelope. 
												//Beware of low cutoff when using RLPF 
		LFNoise1.kr(0.4, 0.45, 0.55),  // 0.55 to 1 varying reciprocal Q
		0.1*In.kr(inbus, 1)			//low level, controlled by global envelope	
	);
	w2=RLPF.ar(
		WhiteNoise.ar(1), 
		LFNoise1.kr(0.5, 1000, 1100)*In.kr(inbus, 1) + 20,
		LFNoise1.kr(0.4, 0.45, 0.55), 
		0.1*In.kr(inbus, 1)
	);
	Out.ar(0,[w1, w2] )
}).send(s);
)

//Thunder. Obviously filtered noise with two triggers: 1 for rumbling en 1 to start a thunderclap
(
SynthDef (\donder, {
	arg inbus;
	var trig1, trig2;
	trig1=Dust.kr(0.05	* In.kr(inbus, 1));//slow trigger for each thunder, controlled by global envelope	
trig2=Dust.kr(15);						//fast trigger for rumbling
	Out.ar(0,
		FreeVerb.ar( 
			Pan2.ar(
				RLPF.ar(						//filter, in, freq, rq, mul, add
					WhiteNoise.ar(1),		//white noise is the basis
					1500 *						//maximum frequency
					EnvGen.kr(				//how one thunder goes
						Env.perc(	0.05, 16, 1, -1),//attack, release, peak, curve
						trig1					//slow trigger
					)							//end of EnvGen for frequency
					* In.kr(inbus, 1) + 20,// bad things happen when frequency = 0
					0.55,						// reciprocal Q
					EnvGen.kr(				//rumbling, controls amplitude
						Env.perc(0.01, 0.5, 2, -1),
						trig2					//fast trigger
					)							// end of for amplitude
				),								//end of LPF
				LFNoise1.kr(0.1)			//freq
			),									//end of Pan2
			0.5,								//mix
			0.75,								//room
			0.5									//damp
		)										//einde FreeVerb
	)
}).send(s)
)

//Global controlbus
b=Bus.control(s, 1);
g=Synth(\global, [\uitbus, b, \duur: 300]); //300 is number of seconds. Change this if you like
//Here comes the rain
r=Synth.after(g, \regen, [\inbus, b]);
q=Synth.after(g, \regen2, [\inbus, b]);
//here comes the wind
w=Synth.after(g, \wind, [\inbus, b]);
//thunder
d=Synth.after(g, \donder, [\inbus, b]);

d.free;
r.free;
q.free;