Sequential Circuits Prelude

American Rebrand of Siel Orchestra 2 with different case color, sound the same


OVERVIEW  C-C 49 keys with full polyphony, 32 sliders , 8 push buttons. No display.
The Prelude a 4-part string processor synthesizer with 4 sounds presets: Brass, Strings, Organ and Piano, of which up to two can sound at the same time.

- Siel Orchestra 2 the same, also known as OR400
- Sequential circuits FUGUE, similar design, another rebrand from SIEL CRUISE

Terminal connectors:
- main signal out HI LOW
- input signal
- tape Interface
- Volume pedal input
- pedal switch input decay


OSCILLATORS  Divide-down tone generation, the 4 tone color families can be played individually or two can mixed.
 Some section have some tweaks:
-  Brass section with independent attack and sustain controls EG -  cutoff and resonance
 - String section (mute and percussion variations) with independent attack and sustain controls EG
-  Reed section is 2-voice and offers a Celeste sound, accordion and musette.
-  Piano section has two variations, traditional piano,  Hony Tonk, clavichord sound.

EFFECTS a 5-band graphic EQ (250, 500, 1000, 2000 and 4000 Hz) and a kind of flange-type effect in the "animator" section. 

LFO a single Vibrato

Sequential Circuits Prelude  Specifications

Model: Prelude
Brand: Siel / Sequential-Circuits dave Smith
Country: USA
Type: Analog
Synthesis: Subtractive
Year Released: 1983
 Discontinued: 1986
Keyboard: 49 keys (C-C)
Polyphony: 49 notes
Patches Preset: 4 

Equalizer (250, 500, 1000, 2000 and 4000 Hz)
LFO (speed, depth and delay)
Transpose (pitchbend)
Animator (=chorus) and Flanger effect
External audio input.
No CV/Gate in/out puts 

Filters  Low Pass, Resonance 
LFO: 1 Simple set waveform LFO with depth and speed controls 

Animator which is a flanger effect + EQ

Controls: Buttons, Faders, Switches
Display Type: NONE

Audio Output Connections: 1/4" Phone Jack, Stereo Main

M086 TOS, TDA1008 6 stage divider
 LM13700 dual OTA 

Weight: NA
Dimensions: NA

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