Slot Parameters

Slot Parameters

Every one of the 16 slots has the same 25 sound parameters plus a Source. In your DAW they appear as S01 Wave, S01 Pulse Width, … S16 Loop X-Fade (parameter IDs s01_wave … s16_xfade).

Source: Empty, Synth or Sample

A slot has one of three sound sources:

Source	What it does
Empty	Silent. Playing the pad makes no sound, triggers no choke group and is never latched.
Synth	The dub siren described below.
Sample	Plays an audio file; see Samples.

The source is the host parameter S01 Source (it is not automatable) and is chosen in the plugin window: click an empty pad to pick Synth or a sample; use the pad's right-click menu to clear it again.

How a siren is built (source: Synth)

 oscillator ──► amp envelope ──► volume / pan ──► dry + FX send
     ▲
 pitch = base pitch · 2^((LFO·depth + sweep + perf pitch) / 12)

The pitch is the heart of a dub siren: a base pitch, pushed up and down by a pitch LFO (the classic "wee-woo"), optionally with a pitch sweep at the start of every note (lasers, risers, drops). The resulting frequency is limited to 10 Hz – 18 kHz.

The slot editor shows the Synth parameters in four rows: OSC/AMP, LFO, SWEEP/TRIG and MIX.

Oscillator

Label	Parameter	Range	Default	Notes
Wave	Wave	Sine / Triangle / Saw / Square	Square	Saw and square are band-limited (no aliasing on high sirens).
Pitch	Pitch	20 Hz – 5 kHz	440 Hz	Base pitch; the LFO moves upwards from here.
Pulse Width	Pulse Width	5 – 95 %	50 %	Square wave only.

LFO (modulates pitch)

Label	Parameter	Range	Default	Notes
Shape	LFO Shape	Square, Triangle, Saw Up, Saw Down, Sample & Hold	Square	Square = classic two-tone siren; saw up/down = rising/falling siren; S&H = random pitches ("UFO").
Rate	LFO Rate	0.05 – 40 Hz	2 Hz	Used when Sync is off.
Sync	LFO Sync	off / on	off	Locks the LFO to the host tempo.
Sync Rate	LFO Sync Rate	1/32, 1/16T, 1/16, 1/8T, 1/8, 1/4T, 1/4, 1/2, 1 Bar, 2 Bars, 4 Bars	1/8	Length of one LFO cycle; used when Sync is on.
Depth	LFO Depth	0 – 48 semitones	12	How far above the base pitch the LFO goes.

The LFO output runs from 0 to 1, so the pitch moves between the base pitch and base + depth. Every (re)trigger restarts the LFO at the same phase, so a siren always starts the same way; Sample & Hold picks a new random value on every trigger and every LFO cycle.

Sweep (pitch envelope)

Label	Parameter	Range	Default	Notes
Amount	Sweep Amount	−48 … +48 semitones	0	Positive: starts higher and falls to the base pitch. Negative: starts lower and rises.
Time	Sweep Time	10 ms – 10 s	0.5 s	Duration of the sweep (linear in semitones).

Amp envelope

Label	Parameter	Range	Default	Notes
Attack	Attack	0 – 5 s	5 ms	Minimum 1 ms internally (avoids clicks).
Release	Release	0 – 10 s	0.3 s	Fade-out after note-off / latch-off / one-shot end.

Attack and release apply to samples as well.

Trigger

Label	Parameter	Range	Default	Notes
Mode	Trigger Mode	Gate / Latch / One-Shot	Gate	See Trigger Modes and Choke.
Length	One-Shot Length	50 ms – 10 s	1 s	One-Shot duration before the release starts (Synth).
Choke	Choke Group	None, 1–4	None	See Trigger Modes and Choke.

Mix

Label	Parameter	Range	Default	Notes
Volume	Volume	−60 … +6 dB	−6 dB	−60 dB = muted.
Pan	Pan	L100 … R100	centre	Equal-power panning.
FX-Send	FX-Send	0 – 100 %	30 %	Share of the slot that goes into delay and reverb. The rest bypasses them. Drive and filter always act on the whole signal.

Volume, pan and FX send are smoothed (~20 ms), so turning them live does not zipper.

Sample parameters (source: Sample)

For sample slots the editor shows the rows SAMPLE/AMP, LOOP/TRIG and MIX with a waveform strip. The parameters below only act on samples; details in Samples.

Label	Parameter	Range	Default	Notes
Tune	Tune	−24 … +24 semitones	0	Transposes the sample (it plays faster or slower). The siren ignores it.
Start	Sample Start	0 – 1	0	Where playback starts, as a share of the sample length.
Loop Start	Loop Start	0 – 1	0	Where the loop begins.
End	Sample End	0 – 1	1	Where playback ends.
Loop	Loop	off / on	off	Repeats the loop section while the note is held.
Reverse	Reverse	off / on	off	Plays the sample backwards.
X-Fade	Loop X-Fade	0 – 50 %	5 %	Crossfade at the loop seam, as a share of the loop length.

The three position values are normally set by dragging the markers in the waveform strip.