Correct DSP examples (voltage range). Improve documentation.

Faust.md

@@ -25,11 +25,11 @@ So a button or checkbox UI item can use the `[switch:N]` metadata to be associat
 Other metadata:
 - `[scale:lin|log|exp]` metadata is implemented.
 
-The [rack.lib](https://github.com/VCVRack/VCV-Prototype/blob/faust/res/faust/rack.lib) Faust library contains usefull functions to convert VC signals, and can be enriched if needed. 
+The [rack.lib](https://github.com/VCVRack/VCV-Prototype/blob/faust/res/faust/rack.lib) Faust library contains usefull functions to convert CV signals, and can be enriched if needed. 
 
 ## DSP examples
 
-Here is a simple example showing how oscillators can be controlled by UI items:
+Here is a simple example showing how oscillators can be controlled by GUI items, associated with metadata in the DSP code:
 
 ```
 import("stdfaust.lib");
@@ -40,9 +40,11 @@ gain = hslider("gain [knob:2]", 0.5, 0, 1, 0.01);
 gate = button("gate [switch:1]");
 
 // DSP processor
-process = os.osc(freq) * gain, os.sawtooth(freq) * gain * gate;
+process = os.osc(freq) * gain * 5, os.sawtooth(freq) * gain * gate * 5;
 ```
 
+Following the VCV Prototype model, note that audio outputs **are multipled by 5** to follow the [-5v..5v] range convention. 
+
 The standard examples ported to Faust can be seen in the examples folder:
 
 - [gain.dsp](https://github.com/VCVRack/VCV-Prototype/blob/faust/examples/gain.dsp)

examples/organ.dsp

@@ -18,7 +18,7 @@ Additive synth: 3 sine oscillators with adsr envelop.
 Use the 3 first VC inputs to control pitch, gate and velocity.
 */
 
-process(pitch, gate, vel) = voice(freq) * en.adsr(attack, decay, sustain, release, gate) * vel : *(vol) : panner(pan)
+process(pitch, gate, vel) = voice(freq) * en.adsr(attack, decay, sustain, release, gate) * vel : *(vol) : panner(pan) : *(5),*(5)
 with {
 	freq = cv_pitch2freq(pitch);	
-};
+};

examples/physicalmodel.dsp

@@ -43,4 +43,4 @@ with {
 		between 0 and 1 with 1 for the maximum amount of reverb.]", 0.3333, 0, 1, 0.025));
 };
 
-process = frenchBell_ui <: freeverb_demo;
+process = frenchBell_ui <: freeverb_demo : *(5),*(5);

examples/synth.dsp

@@ -31,4 +31,4 @@ swl_red(i) = vbargraph("[switchlight_red:%i]", 0, 1);
 swl_green(i) = vbargraph("[switchlight_green:%i]", 0, 1);
 swl_blue(i) = vbargraph("[switchlight_blue:%i]", 0, 1);
 
-process = os.osc(freq1) * vol1, os.sawtooth(freq2) * vol2 * gate, os.square(freq2) * vol2 * check;
+process = os.osc(freq1) * vol1 * 5, os.sawtooth(freq2) * vol2 * gate * 5, os.square(freq2) * vol2 * check * 5;