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: The synthesiser needs to know the sample rate of the audio output.: We add the sound so that the synthesiser knows which sounds it can play.This number of voices added determines the polyphony of the synthesiser. : We add some voices to our synthesiser.Our MainContentComponent class contains the following data members. For example, this may contain the sample data for a sampler voice or the wavetable data for a wavetable synthesiser. A sound class is effectively a description of the sound that can be created as a voice.

SineWaveSound: This contains a custom SynthesiserSound class called SineWaveSound.A single instance of a voice class renders one voice. A voice class renders one of the voices of the synthesiser mixing it with the other sounding voices in a Synthesiser object. SineWaveVoice: This is a custom SynthesiserVoice class called SineWaveVoice.This outputs all of the audio from the synthesiser. SynthAudioSource: This implements a custom AudioSource class called SynthAudioSource, which contains the Synthesiser class itself.There are various classes needed to get this to work and in addition to our standard MainContentComponent class, these are: This shows you all the basic elements needed to customise the synthesiser with your own sounds in your own applications. This tutorial makes use of the JUCE Synthesiser class to implement a polyphonic synthesiser. This allows you to play the synthesiser polyphonically. Using keys on the computer keyboard the on-screen keyboard can be controlled (using keys A, S, D, F and so on to control musical notes C, D, E, F and so on).

The application window containing a MidiKeyboardComponent