ferraus chorus

Chorus (or chorus/flanger blend)

Synopsis

ferraus chorus <input> [options] [-o <output>]

What it does

Several slowly modulated delay voices thicken the sound; stereo channels get offset LFO phases for width. --mode flanger blends in flanger character (shorter delays with feedback).

This command is also an fx stage and a pipeline op: ferraus fx in.wav -o out.wav --fx "chorus:key=value".

Examples

Classic two-voice chorus

ferraus chorus gtr.wav -o gtr_chorus.wav

Lush four-voice chorus

ferraus chorus synth.wav --voices 4 --depth 5ms --rate 0.4Hz --mix 40% -o lush.wav

Single-voice, subtle chorus that keeps a bass solid

ferraus chorus bass.wav --voices 1 --depth 2ms --mix 30% -o bass_chorus.wav

Chorus/flanger blend for a swirling keyboard

ferraus chorus keys.wav --mode flanger --rate 0.2Hz -o keys_swirl.wav

Options

Flag	Type	Default	Meaning
`--rate`	frequency	`0.8Hz`	LFO rate
`--depth`	time	`3ms`	Delay sweep width
`--voices`	integer	`2`	Number of delay voices Range: 1..8.
`--mix`	percent	`50%`	Dry/wet: 0% returns the input
`--mode`	chorus \| flanger	`chorus`	chorus, or flanger for a chorus/flanger blend

Global options

Every command also accepts the global options (-o, --json, --dry-run, --overwrite, --progress, ...). See Global options.

Exit codes

Code	Meaning
0	Success
1	Processing failed
2	Usage or parameter error
3	Input missing or unreadable
4	Unsupported format or codec
8	Cancelled
70	Internal error (bug)

Common mistakes

Forgetting that outputs are never overwritten: pass --overwrite or a new -o path when re-running.
Beat-based times (4b, 1/4) need a tempo: pass --bpm or write 4b@120.
Percentages accept 80% or the fraction 0.8; a bare 80 means 80x, not 80%.

For models

MCP tool: ferraus_chorus
Schema: ferraus schema chorus
Pipeline: { op: chorus, args: { ... } } (flag names with _ instead of -)
fx stage: yes

{"command": "chorus", "defaults": {"rate": "0.8Hz", "depth": "3ms", "voices": "2", "mix": "50%", "mode": "chorus"}}