1. Dissolve/Fade Out.
This is not a filter but is useful to put at the end of a track of audio to avoid pops.
2. Echo/Reverb.
2. Echo/Reverb.
You use this effect if you did not pick it up on location and for psychological effects.Ask yourself how long a sound carries on in a location. For example if you clap your hands in a church then outside, the sound will seem to last longer in the church. This filter is used to match sounds you might have gotten from a library or recorded somewhere else to the location.
3. Equalizer.
3. Equalizer.
Think of it as a frequency specific volume controller. You use this to make different frequencies louder or quieter. It can be used to emphasize a voice and balance a recording. For example you may have recorded someone playing a piano but in the recording you mostly pick up the treble notes. Using the equalizer you can bring in more of the bass and mid-range notes. An equalizer can also be used if you just want the bass of the music, such as if the characters are outside a club. Here you would cut (lower) the high frequencies to create a realistic sound.
4. Compression/Normalization.
4. Compression/Normalization.
Dialogue varies in volume so a compressor is used to smooth out the loud bits which makes the dialogue seem closer and more intimate. This effect is used extensively on narration and whispering dialogue. Normalization is more harsh than a compressor and should not be used, unless the audio levels are too low to achieve the proper loudness even with compression.
5. Notch filter.
5. Notch filter.
Notch filters are essentially equalizers set to remove specific problematic frequencies. You can get rid of continuous sounds such as fridge, camera, hum.
6. High pass.
6. High pass.
This helps you eliminate rumble and sounds such as unwanted footsteps, traffic and wind. Set it to roughly around 80 Hz.
7. Expander/noise gate.
7. Expander/noise gate.
This filter softens noise below a certain level so as to remove some background sound.
8. Noise removal.
8. Noise removal.
This filter is available in Soundtrack Pro and works by you selecting a quiet part of a clip with bad hiss or background sound then it will work on the whole clip. This filter produces varying results.
9. Keyframes.
9. Keyframes.
Key fram is another way of making sound constant throughout a clip.