1.1 Introduction

SoundFX is the ultimate sound effects processor plugin for Hollywood. It supports almost 60 different effects and transformations that can easily be applied to Hollywood samples. On top of that, it can also analyze audio data and generate new sounds by synthesizing tones from given text parameters. Finally, the plugin can also be used to join, mix or merge multiple samples into new ones or change the audio format of samples.

The SoundFX plugin features a convenient interface which allows you to easily apply all kinds of effects to existing Hollywood samples using just a single function call. It's also possible to monitor the status of the sound processor by specifying a callback function that will be called from time to time to give your script a status update. The callback function can also be used to log messages from the sound processor.

The following sound effects are currently supported:

Analysis effects

• noiseprof: Produce a DFT profile of the audio (use with noisered)
• stat: Enumerate audio peak & RMS levels, approx. freq., etc.
• stats: Multichannel aware stat

Editing effects

• pad: Pad (usually) the ends of the audio with silence
• silence: Remove portions of silence from the audio
• splice: Perform the equivalent of a cross-faded tape splice
• trim: Cuts portions out of the audio
• vad: Voice activity detector

Low-level signal processing effects

• biquad: 2nd-order IIR filter using externally provided coefficients
• downsample: Reduce sample rate by discarding samples
• fir: FFT convolution FIR filter using externally provided coefficients
• upsample: Increase sample rate by zero stuffing

Mastering effects

• dither: Add dither noise to increase quantisation SNR
• rate: Change audio sampling rate

Miscellaneous effects

• synth: Synthesise/modulate audio tones or noise signals

Mixing effects

• channels: Auto mix or duplicate to change number of channels
• divide+: Divide sample values by those in the 1st channel (W.I.P.)
• remix: Produce arbitrarily mixed output channels
• swap: Swap pairs of channels

Pitch/tempo effects

• bend: Bend pitch at given times without changing tempo
• pitch: Adjust pitch (= key) without changing tempo
• speed: Adjust pitch & tempo together
• stretch: Adjust tempo without changing pitch (simple alg.)
• tempo: Adjust tempo without changing pitch (WSOLA alg.)

Production effects

• chorus: Make a single instrument sound like many
• delay: Delay one or more channels
• echo: Add an echo
• echos: Add a sequence of echos
• flanger: Stereo flanger
• overdrive: Non-linear distortion
• phaser: Phase shifter
• repeat: Loop the audio a number of times
• reverb: Add reverberation
• reverse: Reverse the audio (to search for Satanic messages ;-)
• tremolo: Sinusoidal volume modulation

Specialised filters/mixers

• deemph: ISO 908 CD de-emphasis (shelving) IIR filter
• earwax: Process CD audio to best effect for headphone use
• noisered: Filter out noise from the audio
• oops: Out Of Phase Stereo (or Karaoke) effect
• riaa: RIAA vinyl playback equalisation

Tone/filter effects

• allpass: RBJ all-pass biquad IIR filter
• bandpass: RBJ band-pass biquad IIR filter
• bandreject: RBJ band-reject biquad IIR filter
• band: SPKit resonator band-pass IIR filter
• bass: Tone control: RBJ shelving biquad IIR filter
• equalizer: RBJ peaking equalisation biquad IIR filter
• firfit+: FFT convolution FIR filter using given freq. response (W.I.P.)
• highpass: High-pass filter: Single pole or RBJ biquad IIR
• hilbert: Hilbert transform filter (90 degrees phase shift)
• lowpass: Low-pass filter: single pole or RBJ biquad IIR
• sinc: Sinc-windowed low/high-pass/band-pass/reject FIR
• treble: Tone control: RBJ shelving biquad IIR filter

Volume/level effects

• compand: Signal level compression/expansion/limiting
• contrast: Phase contrast volume enhancement
• dcshift: Apply or remove DC offset
• fade: Apply a fade-in and/or fade-out to the audio
• gain: Apply gain or attenuation; normalise/equalise/balance/headroom
• loudness: Gain control with ISO 226 loudness compensation
• mcompand: Multi-band compression/expansion/limiting
• norm: Normalise to 0dB (or other)
• vol: Adjust audio volume