Modulator (PB only)

This effect adds both vibrato and tremolo to audio by modulating (varying) the frequency and amplitude. You can create a Doppler effect, such as when a train whistle gets higher in pitch as it approaches an observer, and then drops in pitch as it passes. Use Sine modulation to produce the purest sounds; use Triangle to produce more distorted sounds.

For more information, see the After Effects product section on Adobe's Web site.