ferraus tremolo

Tremolo (amplitude modulation)

Synopsis

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

What it does

Modulates the level with an LFO; the gain swings between full and (1 - depth). --rate also accepts beat values like 1/8 with --bpm.

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

Examples

Classic amp tremolo

ferraus tremolo gtr.wav -o gtr_trem.wav

Tempo-synced chop

ferraus tremolo pad.wav --rate 1/8 --bpm 100 --shape square --depth 90% -o chop.wav

Soft, slow electric-piano tremolo

ferraus tremolo keys.wav --rate 4Hz --depth 30% --shape triangle -o keys_trem.wav

Full-depth sixteenth-note stutter at 128 BPM

ferraus tremolo gtr.wav --rate 1/16 --bpm 128 --depth 100% --shape square -o gtr_stutter.wav

Options

Global options

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

Exit codes

Common mistakes

• Forgetting that outputs are never overwritten: pass --overwrite or a new -o path when re-running.
• Percentages accept 80% or the fraction 0.8; a bare 80 means 80x, not 80%.

For models

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

{"command": "tremolo", "defaults": {"rate": "5Hz", "depth": "50%", "shape": "sine", "mix": "100%"}}