Commits on May 23, 2022

1. Add FFT based vocoder effect …

   This works by using the left channel as the modulator and the right
   channel as the carrier. A parameter for adding white noise helps to
   improve intelligibility for spoken/sung texts. Another parameter for
   gating the carrier helps reduce low level signals causing continuous
   output.
   
   ```
   live_loop :foo do
     with_fx :vocoder, gate_threshold: 0.9, noise_ratio: 0.25  do
       pth = :loop_amen
       sample pth, pan: -1
       x = synth :dsaw, pan: 1, note: :a3, sustain: sample_duration(pth), note_slide: 0.1
       32.times do
         control(x, note: [scale(:a3, :minor_pentatonic, num_octaves: 1).choose])
         sleep sample_duration(pth) / 32
       end
     end
   end
   ```

   

   xavriley committed May 23, 2022
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