adding env and pan example

Env_and_Pan2.scd

@@ -0,0 +1,58 @@
+/*
+
+An example of:
+- use of variables
+- use of Pan2.ar to have stereo
+- use of Env().kr() to create start and
+  end fades of sound stream 
+
+*/
+( 
+{
+	// define variables' names we will need
+	var fadein, duration, fadeout, pan;
+	
+	// assign values (or synths!) to variables
+	fadein = 4; // fade-in in seconds
+	duration = 50; // duration in seconds
+	fadeout = 5; // fade-out in, you guessed it, seconds!
+	
+	// panning left-right: from "-1" to "1". 0 is center.
+	// do you dare to put an UGen instead of floating point number?
+	pan = LFNoise1.kr(0.5).range(-1,1); 
+	         
+	// a mono signal "inside" the Pan2 UGen will become stereo with a pan
+	Pan2.ar( 
+		in:
+		//...... your code ..........
+		// for example:
+		(Saw.ar(LFNoise0.kr(0.4).range(50,90)) 
+			* LFPulse.kr(0.4, width: 0.2))
+		+ 
+		(Saw.ar(LFNoise0.kr(0.5).range(100,200)) 
+			* LFPulse.kr(0.5, width: 0.4))
+		+ 
+		(Saw.ar(LFNoise0.kr(0.6).range(100,400)) 
+			* LFPulse.kr(0.6, width: 0.1))
+		+ 
+		(Saw.ar(LFNoise0.kr(0.7).range(40,150)) 
+			* LFPulse.kr(0.7, width: 0.3))
+		* 0.2
+		//
+		// .... end of your code.
+		, // this comma separates arguments inside Pan2.ar: (in, pos, level)
+		// define position in the stereo
+		pos: pan, 
+		
+		// define level. 
+		// we use a simple basic envelope definition to create
+		// fade-in and fade-out 
+		level: Env([0,1,1,0], [fadein, duration, fadeout]).kr(2);
+		
+		// check the shape with .plot:
+		// Env([0,1,1,0], [4,50,5]).plot 
+		// just select above code and evaluate with ctrl+enter)
+		
+	)	
+}.play
+)