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These sixteen filters are arranged in pairs (a pair for each channel). Table 6-1 shows how the frequencies adjusted by "FORMANT SHIFT" and "CUTOFF" correspond to the frequencies of the sixteen filters. 7. FC MOD — VOCODER These parameters select the modulation source that will vary the cutoff frequency of the carrier band-pass filter (the synthesis filter), and specify the depth of the modulation. For example if you set the modulation source "SOURCE" (knob 1) to AMP EG (A.EG) and use "INTENSITY"