Stereoid

A stereo widener for Schwung on Ableton Move: one audio effect, four engines, one page of knobs.

Engine	What it does	A stereo input	Mono sum
Comb	Adds a delayed copy of the mid to one side and subtracts it from the other (a Lauridsen complementary comb). No lean.	Keeps the width it came with; the mid is what widens	Exactly the input
Haas	Delays one side. The image leans toward the side that arrives first; that lean is the character.	One whole channel is delayed	Combs
Disperse	An all-pass and comb widener modelled from measurement of a commercial widener's output.	Each channel widens from itself; a hard-panned sound stays on its side	Exact for a mono input
M/S	Scales the side the input already has: the classic width control. Does nothing to a mono source; the most audible on a stereo mix.	Its whole job	Exactly the input

Comb, Haas and Disperse create width, so they do the most to mono or centred material. M/S turns up (or down, to mono at -100) the width that is already there.

Knobs

Knob	Range
MODE	Comb, Haas, Disperse, M/S	The engine
WIDE	-100..+100 %	Width. 0 is a true bypass. The sign mirrors: which side is delayed (Haas), or which side gets which comb teeth. In M/S it is the side level: -100 mono, +100 double
WFREQ	20..4000 Hz	Nothing below it is widened. 20 = full band
TIME	0..12 ms	Not in M/S. The delay. 0 = Auto: each engine's own (Comb 8 ms; Haas and Disperse follow WIDE). In Haas, setting TIME makes WIDE the delayed side's mix
TRIM	-12..0 dB	Output level, by hand. A widener adds to each channel: at full width one can reach twice the input, and nothing here limits it
COMP	Off, Loud, Peak	A trim that follows the width. Loud holds the loudness as you widen (up to -3 dB); Peak holds the worst-case peak (up to -6 dB). Either lowers the mono sum by the same amount; Off leaves it exact
HICUT	1000..20000 Hz	Nothing above it is widened. 20000 = off
LATE	-12..+12 dB	Haas only: the delayed side's level. Up counters the lean, down deepens it

Requires Schwung 1.5.0. Install it from the Schwung manager's module list, or build it yourself:

Build and test

tests/run.sh                              # the offline suite, no device
scripts/build.sh && scripts/install.sh    # cross-compile in Docker, deploy to move.local

MIT licensed.