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10.7.5 Vocoder Example


A Vocoder (short for voice encoder) is a category of voice codec that analyzes and synthesizes the human voice signal for audio data compression, multiplexing, voice encryption, voice transformation, etc. A vocoder can be used in a wide range of musical genres. What you can pass through a vocoder goes of course far beyond simple voice signals (e.g. drum loops, FX Noise, etc.).


A Vocoder analyses the frequency bands of a Modulator signal (usually Voice) and applies them to the Carrier (Synth) signal.


The Modulator signal (in G-Stomper FX:Input1) is passed through a multiband filter, each band is passed through an Level Analyzer, and the control signals from the Level Analyzers are transmitted to the decoder. The decoder applies these (amplitude) control signals to corresponding filters for re- synthesis.


The Carrier signal on the other hand (in G-Stomper FX:Input2) is passed trough the corresponding filters in the decoder, where the frequency Bands of the Modulator get applied.


1. Modulator:

Create a simple Vocal Track (Trigger on step 01) and send it to the FX unit where you loaded the Vocoder A (route it normal to the default Input1, no Side Chaining).


Press Play!

What you hear now is the “vocoded” signal of the Vocal Track.

Since we didn’t pass a Carrier signal to Input2 yet, the default Carrier (a static Synth sound) is used instead.


3. Carrier:

Create s simple Track using a long synthesizer sound (ideally Sawtooth or similar) and send it to the Vocoder A as well. It can be a VA-Beast Synthesizer or a Sampler Track, just make sure that the result is a continuously playing Synth Sound. You’ll get best results when using a Carrier with large harmonic content.


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4. Now long click the FX Send of the Synth Track to send it, still to the Vocoder A, but to Input2 instead of Input1.


Hint: Use the VU Meter in the middle to monitor the Input2 signal.


Press Play again!


What you hear now is the “vocoded” signal of the Vocal Track, but in use of the Carrier signal from Input2.


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