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Download Soundtrack Pro 2 User Manual
Transcript
Graphic EQs Graphic EQs give you a set of filters (often with 10 or 31 filters), each with a set center frequency and bandwidth. Using a graphic EQ, you can shape a wide variety of frequencies throughout the frequency range. Graphic EQs can be used to shape the sound of the overall project mix. Parametric EQs Parametric EQs are similar to bandpass EQs, but provide a greater amount of control, and can be used for extremely precise adjustments. With a parametric EQ, you can set the center frequency, the gain, and the bandwidth. Used carefully, a parametric EQ can help a track cut through the mix, or help a track or project sound fuller. Parametric EQs can also be used to remove specific, unwanted frequencies from a mix. Modulation Effects Modulation effects begin with a delayed signal, like time-based effects, but vary (or modulate) the delay time, typically using a low-frequency oscillator (LFO). This can be used to double a sound, making it seem stronger and “fatter,” to simulate a group of voices or instruments playing together, or to add a distinctive character to the sound. Modulation effects include chorus, phase shifters, and flangers. Chorus Chorus effects play back multiple repetitions of the delayed signal (like reverbs), but vary the delay time for each one, using an LFO. As the name implies, this effect can strengthen the sound, and create the impression that the sound is being played by many instruments or voices in unison. The slight variations in delay time created by the LFO simulate the subtle differences in timing and pitch heard when several people play together. Using chorus also adds fullness or richness to the signal, and can add movement to low or sustained sounds. Phase Shifters Phase shifters produce a characteristic “whooshing” sound by combining the original signal with a copy of the signal that is slightly out of phase with the original. This means that the amplitudes of the two signals’ sound waves reach their highest and lowest points at slightly different times. The time between the two signals is modulated, typically using an LFO. As the two signals go in and out of phase, certain frequencies, called notch frequencies, are created, which give phase shifters their distinctive sound. The main difference between chorus and phase shifting is the amount of delay time. Chorus effects typically use delay times between 20 and 30 milliseconds (ms), while phase shifters (and flangers, discussed next) typically use shorter delay times, between 1 and 10 ms. 336 Chapter 11 Working with Audio Effects
