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The Oscillator Devices SIREN is a Stereo MIDI Volume Controller. Its two fully analog channels can be independently
set from -96dB (Mute) to a whooping +32dB boost. The channels can be split before, or mixed after the volume
control. The SIREN has high quality, low noise buffers and is specifically designed not to color your tone.
The SIREN has two internal LFOs to drive the volume control. That makes it a full blown MIDI Controlled Analog Stereo
Tremolo. Both LFOs operate completely independent. Different waveforms (Sine, Triangle, Rectangle and Ramp in both
directions) can either be free running from 100ms to 1.2s, or can be synced to MIDI clock.
On top of that the SIREN supports Fade and Swell functions. While Fade slowly fades to another volume, the Swell
function snaps back to the original volume when done, ready to be triggered again.
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Input A/B: Two 1/4" mono jacks for inputs of either a guitar, or the output of other FX devices. Check
chapter Input Sensitivity for high input levels like active pickups. Input impedance 1MΩ.
Output A/B: Two 1/4" mono jacks for outputs to other FX devices, amplifiers, modelers etc. Output
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impedance 500Ω.
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Power: 9VDC only, Center Negative, Boss Style power supply. Min. 150mA.
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MIDI In: 3.5mm (1/8") MIDI Input according to MIDI Standard MIDI TRS Type-A.
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MIDI Thru: 3.5mm (1/8") , latency free MIDI Thru according to MIDI Standard MIDI TRS Type-A
Oscillator Devices - Siren – User Manual
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30.12.2023
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Summary of Contents for OSCILLATOR DEVICES SIREN
- Page 1 The SIREN has high quality, low noise buffers and is specifically designed not to color your tone. The SIREN has two internal LFOs to drive the volume control. That makes it a full blown MIDI Controlled Analog Stereo Tremolo. Both LFOs operate completely independent. Different waveforms (Sine, Triangle, Rectangle and Ramp in both directions) can either be free running from 100ms to 1.2s, or can be synced to MIDI clock.
- Page 2 LEDs. Press and hold the PHASE button to save the selection. Upon delivery the SIREN is set to +6dB pre-gain. This is ideal for guitars with passive pickups and normal levels of guitar pedals. In this setting, unity gain is with the knobs at noon, or MIDI CC commands half way (64).
- Page 3 Delay the tremolo by 1/24th of a full duration Finally, there is a single command to control the depth without changing the waveform. Function Channel A Channel B Channel A+B 0-127 Depth of currently running Tremolo (0=off, 127 = Full) Oscillator Devices - Siren – User Manual 30.12.2023...
- Page 4 4. Once the desired channel is set, press the PHASE-button and hold it down until the LED stops flashing. 5. Disconnect the supply voltage. The next time the SIREN is started, it reacts to the selected MIDI channel. To put the SIREN in omni mode skip step 3.
- Page 5 4. The flashing stops and the preset is saved. On top of the 16 user presets (PC 00 to PC 15), the SIREN comes with 16 factory presets (PC 16 to PC 31). These presets should give you a good starting point for experimentation. These are the factory presets along with the MIDI commands that are used to achieve them: Preset Nr.
- Page 6 Mix Off and Split Off. Split the signal of Channel A to both outputs BEFORE the volume control. The stereo path after the SIREN can be set to different volumes, for example to push two different drive pedals or two amps in a stereo amplifier setup. For this choose Split On and Mix Off.
- Page 7 When blending two signals, phase issues can occur, when one signal path inverts the signal. For that case the SIREN can flip the phase of channel A, either with the Phase-Button or MIDI command. For this choose Split Off and Mix On.
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