Faust vumeter in C++ and codebox

gistfile1.txt

Faust code: process = vbargraph("val", -1, 1);

get compiled to this C++:

class mydsp : public dsp {
	
 private:
	
	FAUSTFLOAT fVbargraph0;
	int fSampleRate;
	
 public:
	mydsp() {}

	void metadata(Meta* m) { 
		m->declare("author", "Grame");
		m->declare("compile_options", "-lang cpp -ct 1 -es 1 -mcd 16 -single -ftz 0");
		m->declare("copyright", "(c)GRAME 2006");
		m->declare("filename", "vumeter.dsp");
		m->declare("license", "BSD");
		m->declare("name", "vumeter");
		m->declare("version", "1.0");
	}

	virtual int getNumInputs() {
		return 1;
	}
	virtual int getNumOutputs() {
		return 1;
	}
	
	static void classInit(int sample_rate) {
	}
	
	virtual void instanceConstants(int sample_rate) {
		fSampleRate = sample_rate;
	}
	
	virtual void instanceResetUserInterface() {
	}
	
	virtual void instanceClear() {
	}
	
	virtual void init(int sample_rate) {
		classInit(sample_rate);
		instanceInit(sample_rate);
	}
	
	virtual void instanceInit(int sample_rate) {
		instanceConstants(sample_rate);
		instanceResetUserInterface();
		instanceClear();
	}
	
	virtual mydsp* clone() {
		return new mydsp();
	}
	
	virtual int getSampleRate() {
		return fSampleRate;
	}
	
	virtual void buildUserInterface(UI* ui_interface) {
		ui_interface->openVerticalBox("vumeter");
		ui_interface->addVerticalBargraph("val", &fVbargraph0, FAUSTFLOAT(-1.0f), FAUSTFLOAT(1.0f));
		ui_interface->closeBox();
	}
	
	virtual void compute(int count, FAUSTFLOAT** RESTRICT inputs, FAUSTFLOAT** RESTRICT outputs) {
		FAUSTFLOAT* input0 = inputs[0];
		FAUSTFLOAT* output0 = outputs[0];
		for (int i0 = 0; i0 < count; i0 = i0 + 1) {
			fVbargraph0 = FAUSTFLOAT(float(input0[i0]));
			output0[i0] = FAUSTFLOAT(fVbargraph0);
		}
	}

};

with the "output control" fVbargraph0 which is written at each sample, and the last value only is kept and can be looked 
once by block rate in the fVbargraph0 variable.

Compilation in codebox currently gives:

// Params
@param({min: -1.0f, max: 1.0f}) val = 0;
// Globals
// Fields
@state fVbargraph0_cb : number = 0;
@state fSampleRate_cb : Int = 0;
@state fUpdated : Int = 0;

// Init
function dspsetup() {
	fUpdated = true;
	fSampleRate_cb = samplerate();
}
// Control
function control() {
}
// Update parameters
function update(val) {
	if (fUpdated) { fUpdated = false; control(); }
}
// Compute one frame
function compute(i0) {
	input0_cb = i0;
	fVbargraph0_cb = input0_cb;
	output0_cb = fVbargraph0_cb;
	return [output0_cb];
}
// Update parameters
update(val);
// Compute one frame
outputs = compute(in1);
// Write the outputs
out1 = outputs[0];


And I would need to add:

val = fVbargraph0_cb in the compute(..) function and I would like to "output" val as a control rate value out 
from the codebox code. Is that possible ?