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Siel Cruise

Mono and polysynthesizer (1981)

Combo string processor with monophonic section based on DCO manufactured by Italian Società Industrie Elettroniche during early eighties. The monofonic section is partially derived from previous MONO model, but CRUISE misses some of its original features.

Main Data

Company: SIEL
Model: Cruise
Class: synthesizer
Country: Italy
Weight: 7 Kg
Dimensions: n/a
keyboard: 49 keys
Dates: 1981
Price: 500€ trend up

Display: none
Synthesis: subtractive
Technology: analog PWG
Polyphony: 1 (mono)+ 49 (poly)
Envelope: 1 EG ADSR
Filter: lowpass
LFO: 1 modulator
Effect: analog chorus
Memory: 10 presets
Polyphonic Gen: TDA 1008
Monophonic Gen: M110B1

KEYBOARD 49 keys with no velocity. Main panel features 44 levers and 6 buttons - on the left part a pitchbender joystick with a control slider for portamento level.

Back panel terminal connectors:
- main signal out
- monophonic section separate out
- polyphonic separate out
- 5 dins input for volume swell pedal
- sustain footswitch for piano part
- decay footswitch for polyphonic section
- master tune trimmer.

NO factory reset procedure

DEPUTY MARK II

FREE VST.
NOT official !

- Siel cruise user manual download

- Siel cruise Service manual download

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In details

The Cruise keyboard sound generation is fully analog and split into 2 main sections:

A- monophonic

B- polyphonic

monophonic

partially derived from mono synthesizer based on M110B1 SGS IC

Polyphonic

PWG - Polyphonic Waveforms Generator based on TDA 1008

Mono section

Basically the the oscillator DCO is pretty simple with just sawtooth / square shape + an octave setting at 4' 8' 16' 32. The monophonic section is partially derived from SIEL MONO Features same 10 presets sounds when set in edit mode (called mode "FREE") it is possible to access direct DCO edit.

DCO

2 shapes: sawtooth / square can be edited in free mode

Octave

4 different octave feet settings: 4' 8' 16' 32

10 presets

Preset list: basso tuba, piccolo, trombone, sax, trumpet, flute, violin, guitar, bass and clarinet

IC

sound generation is based on DIP-40 M110B1 SGS-Ates like Jen Sx1000, Crumar composer and many FARFISAs from the era like Doria, FK-50, Louvre, Pergamon, Scala...

ZANZA

POLYPHONIC section

up to 49 voices polyphony based on PWG - Polyphonic Waveforms Generator - with 12 X TDA 1008 - 16 pins frequency dividers. The are 4 PWG presets families with minor edit parameters :

BRASS

Instruments: trombone and trumpet

Controls: filter cutoff-resonance plus a 2-stages EG attack + crescendo.

STRING

Instruments: violin, cello and percussion

Controls: EG control over attack and decay- this control is shared between reed and piano family

REED

Instruments: accordion, musette, church organ

Controls: 1 EG control for attack segment

PIANO

Instruments: piano, clavinet, honkytonk

Controls: variable decay

Effect

EFFECT a single effect ANIMATION based on TDA 1022 - according to the original advertising this effect was aimed to recreate acoustic reverberation of a hall concert type, but it sounds more like an analog chorus.

LFO / EG / FILTER

FILTER

Section is slimmed-down from original MONO synthesizer: VCF is no more multimode but only lowpass controlled by 2 sliders for cutoff and resonance up to self-oscillation.

The KTF is a simple key tracker for more brilliance on higher octaves.