amplitude modulation not working as expected

[ChrisMicro]

The following sketch should be an amplitude modulation. With this it should be possible to produce a sound like
Beep,Pause,Beep,Pause,Beep .....
There seems to be a problem with the VCA.

#ifndef SYNTHTEST_H
#define SYNTHTEST_H
#include "Synth.h"
#include "Modules.h"
#include "ModuleExternalInput.h"

class SynthTest : public Synth
{
public:
ModuleConstant param[8];

SynthTest(Input_Manager * inputManager)
{

    //Define Node Objects
ModuleVCA *moduleVCA_1 = new ModuleVCA();
ModuleWavetableOsc *moduleWavetableOsc_1 = new ModuleWavetableOsc();
ModuleLFO *moduleLFO_1 = new ModuleLFO();

moduleWavetableOsc_1->frequency_input= &ampparam[0];
moduleWavetableOsc_1->wavetable_input= &ampparam[1];
moduleLFO_1->frequency_input= &ampparam[2];
moduleLFO_1->wavetable_input= &ampparam[3];
moduleVCA_1->audio_input=moduleWavetableOsc_1;
moduleVCA_1->cv_input=moduleLFO_1;


this->last_module = moduleVCA_1;
    
}

};
#endif // SYNTHTEST_H

/*

This is espnode86 stuff do not edit

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*/