Settings
Appearance
Dark / Light Mode
Pop-ups
Show startup pop-ups
Show audio tip pop-up
Audio
All effects enabled
Settings are saved in your browser automatically.
Siren
OSC
Electro-Mechanical Siren Synthesizer
This tool works best on a
computer
.
Mobile devices often distort and lag the output sound.
I understand
You can disable pop-ups in the settings
Welcome to
Siren
OSC
HELP
If you are using a
low performance device
, you may want to consider turning off the effects to improve stability and reduce CPU usage.
⚠ This synthesizer can get loud. You may want to set your volume to something like 50% before starting a siren up.
Keep effects on?
(3)
YES
NO
You can disable pop-ups in the settings
Siren
OSC
Reset Settings
All unsaved changes will be lost.
This will clear all saved settings and return SirenOSC to its default state. This cannot be undone.
RESET
CANCEL
Siren
OSC
If your audio
cuts out
or is
too distorted
, try turning off effects or lowering the volume.
Disable all effects
▼ LOWER THE VOLUME
✕ NO THANKS
You can disable pop-ups in the settings
Siren
OSC
ELECTRO-MECHANICAL SIREN SYNTHESIZER
- APHIDAKS
HELP
IDLE
CTR: 0
0 RPM
Preset Manager
SAVE PRESET
LOAD PRESET
BUILT-IN PRESETS ▾
Models
Federal Signal 3T22
Federal Signal Thunderbolt
Federal Signal SD-10
Federal Signal Model 2
Sentry 10V
Sentry 10V2T
ACA Cyclone 125
ACA Hurricane 130
ASC T-128
Effects
Rough
Semi-Smooth
Smooth
Default 1
Default 2
Blower 1
Blower 2
Timers
PGA Timer
AF Timer 1
AF Timer 2
AE5 Programmable
MORE PRESETS…
Preset Model
Preset Manufacturer
Creator
Description
Preset Type
.oscp — Full preset (all settings)
.oscc — Controls only
.osct — Timbre only
.oscft — Timbre & Functions
.oscfx — Effects + Blower
.oscrc — Rotation & Constants only
DOWNLOAD PRESET
Chopper Diagram
SINGLE-TONE
DIAGRAM
HIGH ROTOR
LOW ROTOR
SHOW HIGH VANES
SHOW LOW VANES
ENABLE ANIMATION
0 RPM
RPM OVER TIME
PEAK
─ WAVEFORM
OSCILLOSCOPE
0 Hz
Timbre
Oscillator
Higher Port
Lower Port
Higher Vanes
Lower Vanes
Undertone
Peak RPM
Undertone Fill
Fill Undertone
Chopper Config
Single-Tone
Double-Tone
Double-Chopper
Waveform
Sine
Triangle
Sawtooth
Square
Parabolic
H.Port
0
Hz
L.Port
0
Hz
H.Vane
0
Hz
L.Vane
0
Hz
Undertone
0
Hz
Mixer
65% CAP
H. Vane Length
45%
L. Vane Length
40%
Undertone
50%
Higher Port
100%
Lower Port
95%
Output Volume
75%
Detune
Detune
0 ct
±100 CENTS
-8 ct
Functions
Wind-up
Offset (s)
Function
Linear
Exponential
Sine
Hyperbolic Tangent
Quadratic
Logarithmic
In
Out
Both
Wind-down
Offset (s)
Function
Linear
Exponential
Sine
Hyperbolic Tangent
Quadratic
Logarithmic
In
Out
Both
RPM Snapping
Normal Function Active
Torque Function Active
Vibrato
Enable Vibrato
Speed (s/cycle)
Depth (RPM)
Torque Switching
Enable Torque Switch
Switch RPM
Offset (s)
Function
Linear
Exponential
Sine
Hyperbolic Tangent
Quadratic
Logarithmic
In
Out
Both
Effects
Disable all effects
RPM LOW PASS FILTER
ENABLED
Slope
6 dB/oct
12 dB/oct
24 dB/oct
Function
Linear
Exponential
Sine
Hyperbolic Tangent
Quadratic
Logarithmic
In
Out
Both
At 0 RPM (%)
At Peak RPM (%)
Curve Offset
-1
Cutoff
-- Hz
REVERB 1
ENABLED
Room Size
0%
Decay
100%
Diffusion
0%
Color (HF Damp)
45%
Low Cut
20 Hz
Pre-Delay (ms)
DRY
WET
90%
BLOWER
ENABLE
Amplitude
40%
Smoothing
100%
Output Gain
9%
Crossover Fade (RPM-linked)
Wind-down fade out
Cutoff RPM
Fade Time (s)
Wind-up fade in
Fade-in RPM
Fade-in Time (s)
Vol Reduction
NONE
FULL
90%
DRY
WET
100%
IDLE
REVERB 2
ENABLED
Room Size
100%
Decay
48%
Diffusion
9%
Color (HF Damp)
60%
Low Cut
80 Hz
Pre-Delay (ms)
DRY
WET
30%
LOW PASS FILTER
ENABLED
Cutoff (Hz)
Resonance (Q)
DRY
WET
100%
HIGH PASS FILTER
ENABLED
Cutoff (Hz)
Resonance (Q)
DRY
WET
100%
DISTORTION
ENABLED
Drive
80%
Tone (Post LPF Hz)
Character
Soft Clip
Hard Clip
Fuzz
Bit Crush
Output Gain
100%
DRY
WET
100%
Controls
Power
Active
TEST (HOLD)
STEADY
CUSTOM
CANCEL
BREAK
Custom Signal
On (ms)
Off (ms)
Dampers
ENABLE
High Tone ON
Low Tone ON
Pulse
Hi-Lo
Constant
Undulate
RPM Raise
Raise Time (s)
Return Time (s)
Rate (ms)
Rate Offset (ms)
Contactor Motor
SIMULATED
Side 1: ON
Side 2: OFF
Side 3: ON
Side 4: OFF
MAX RPM:
--
Contactor Wind-up
Offset (s)
Function
Linear
Exponential
Sine
Hyperbolic Tangent
Quadratic
Logarithmic
In
Out
Both
Contactor Wind-down
Offset (s)
Function
Linear
Exponential
Sine
Hyperbolic Tangent
Quadratic
Logarithmic
In
Out
Both
DEFAULT DAMPER STATE: ON
Rotation
Reverb
DRY
WET
0 RPM
ROTOR
Current Mix
100%
Peak Dry %
Peak Wet %
Max RPM
LINK CHOPPER
ROTATION REVERB
ENABLE
Room Size
100%
Decay
100%
Diffusion
90%
Color (HF Damp)
40%
Low Cut
40 Hz
Pre-Delay (ms)
Mix (Dry/Wet)
50%
Constants
A
ENABLE
Frequency (Hz)
Waveform
Sine
Triangle
Sawtooth
Square
White Noise
Volume
4%
LPF Cutoff (%)
2%
RPM-Linked LPF
-- Hz
B
ENABLE
Frequency (Hz)
Waveform
Sine
Triangle
Sawtooth
Square
White Noise
Volume
13%
LPF Cutoff (%)
7%
RPM-Linked LPF
-- Hz
Made by
@AphidAks
© 2026 AphidAks — CC BY-NC-SA 4.0
TUTORIAL
RESET SETTINGS
RECORD MODE
00000
RPM
Status
Power
Active
Tones
High Tone
Low Tone
Made in
SirenOSC
BY APHIDAKS
Frequency Monitor
H.Port
--
0
Hz
L.Port
--
0
Hz
H.Vane
--
0
Hz
L.Vane
--
0
Hz
Undertone
--
0
Hz
Const A
MAX
--
Hz
Const B
MAX
--
Hz
Chopper Diagram
Line Graph
Oscilloscope
0 Hz
Controls
TEST (HOLD)
ALERT
CUSTOM
CANCEL
BREAK
Dampers
ENABLE
Pulse
Hi-Lo
Constant
Undulate
Contactor
DISABLED
Cur
0 RPM
Max
-- RPM
S1: ON
S2: OFF
S3: ON
S4: OFF
Rotation
OFF
ENABLE
Max RPM
-- RPM
Linked
No
DRY
WET
0 RPM
Speed
0 RPM
Angle
0
°
Information
Model
—
Manufacturer
—
Description
—
Creator
—
Made In
—
Siren
OSC
HELP
9:16
NORMAL MODE