Siel Orchestra II  (1983)

Upgrade version of previous Siel Orchestra with basically same sound but with more edit


OVERVIEW  C-C 49 keys with full polyphony, 32 sliders , 8 push buttons. No display.
The Orchestra 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 Mk1 also known as Arp Quartet
- Siel OR400 quite the same with different outfit case
- Sequential Circuits Preludedis an US rebrand with black outfit
NOTE: Siel orchestra 2 exists also with a blue outfit, same as labeled "OR400"

Terminal connectors:
- main signal out HI LOW
- input signal
- tape Interface
- Volume pedal input
- pedalswitch 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 (same as mk1)
-  Brass section with independent attack and sustain controls EG
 - String section with independent attack and sustain controls EG
-  Organ section is 2-voice and offers a Celeste sound 
-  Piano section has two variations:, traditional piano or Hony Tonk

- piano adds a clavichord sound.
- reed adds two additional instruments: accordion and musette.
- string section adds two pots: mute and percussion
-  Brass features additional pot for cutoff and resonance and sound a bit different 

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

"Our marketing and sales guys back then wanted to add some products to our line, so they contacted Siel about private-branding some keyboards. These were all very close or identical to other Siel products, just with new paint jobs." DAVE SMITH

Siel Orchestra II  Specifications

Model: Orchestra 2
Brand: Siel
Country: Italy
Type: Analog
Synthesis: Subtractive
Year Released: 1983
 Discontinued: 1986
Keyboard: 49 keys (C-C)
Polyphony: 49
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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