Summary of "5 Vocoder Tricks You Didn't Know | Au5 Tutorial"
Video Summary
The video tutorial explores advanced techniques and creative tricks using Ableton's Vocoder, focusing on enhancing sound design and improving Vocoder clarity and flexibility. It begins with an explanation of how vocoders work, emphasizing the filter bank structure and the roles of the modulator and carrier signals. The tutorial then dives into five key Vocoder tricks:
- Frequency Band Redistribution (Frequency Reshifting): By using two frequency shifters—one before and one after the Vocoder—the frequency bands are shifted up and down, effectively changing the band distribution from logarithmic (pitch-based spacing) to more linear (frequency-based spacing). This results in better clarity, more detailed high frequencies, fuller lows, and reduced phase shift issues, especially in the low end.
- Spectral Expansion and Gating: Setting the Vocoder’s carrier to modulator mode (self-modulation) creates spectral contrast by expanding louder frequencies and reducing quieter ones. Adjusting the depth and gate parameters enhances this effect, allowing for dynamic spectral gating that emphasizes prominent frequencies while silencing less important ones. Combining this with frequency redistribution reduces unwanted low-end ringing and improves articulation.
- Tilt Shelf and Gain Trim for Frequency Bias: Using EQ8 filters configured as flat tilt shelves before and after the Vocoder chain allows the user to bias the frequency spectrum toward bass or treble on input and compensate on output. This provides control over the spectral balance and gain, improving the flexibility of spectral contrast and gating.
- Decolorizing Filter (Noise Mode): Setting the Vocoder to noise mode removes tonal components but preserves the overall dynamics and formants of the signal. Applying frequency redistribution here restores bass articulation and high-frequency detail, making the processed sound clearer and more natural.
- Making the Vocoder Linear Phase: The Vocoder’s band pass filters introduce phase shifts, especially at low frequencies. To counteract this, the tutorial demonstrates capturing the Vocoder’s phase response using a one-sample impulse, recording the output, reversing the impulse, and loading it into a convolution reverb (Ableton’s Hybrid Reverb in convolution mode). This process compensates for phase shifts, resulting in a nearly linear-phase Vocoder with minimal latency (~20 ms). The tutorial also shows how to compensate for latency using a delay compensation plugin.
Finally, the video covers sound designing risers with the Vocoder, using noise generators and manipulating band count, bandwidth, formant, and range controls to create evolving textures and risers. The redistributed band Vocoder provides more control and interesting sonic results compared to the default logarithmic band distribution.
The tutorial concludes with a mention of the creator’s sound design masterclass, “School of Bass,” which offers deeper dives into these and other sound design techniques.
Speakers in the video:
- Au5 (the tutorial presenter and creator)
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