Opera 6 (1983-85)

6 voices
12 DCO's or VCO's
61-note (C-C)
95 programs
MIDI velocity-sensitive synth. (4 levels)

After version 1 was released 2 other versions would follow fixing small design faults,
having a better layout, an extra modulation wheel and some other enhancements.
The first two versions had VCO's, the third version could have DCO's or VCO's. Even if it
was labeled DCO's you could find VCO's inside. Also visa versa. I would say having a version
with VCO's might sound a little bit better, but overall the different versions sound pretty close.
Another upgrade was released under the name Kiwi. Also the DK 600 is an updated version of the Opera 6

How do you recognize the different versions from the outside?

Version 1:
- Color gray
- horizontal lines all over the upper half of the synth
- one modulation wheel
- tiny memory select push buttons close to each other
- VCO written on it.

Version 2:
- Color blue
- horizontal lines separated by blocks around the knobs.
- repositioned memory push buttons with more space between
- two modulation wheels separated by two buttons.
- VCO written on it.

Version 3:
- color blue
- two modulation wheels next to each other, no buttons between.
- VCO or DCO written on it.

The MIDI implementation of all versions is Note on/off, velocity and program change. No midi dumps,
but offcourse you could save to tape. If you have a Siel expander it is possible to dump
a patch via midi from the Opera to the Expander.

Operation System

There are different software versions,the early versions might not support midi omni and keyboard spit.
Check if you can type in 96, which should be midi channel select. 00=1, 01=2, etc.
Parameter 97 is keyboard split and 95 is memory protect.


DCO A Saw and Square with PW/PWM
Range 16'/8'/4'

DCO B SAW and Square with PW/PWM
Octave (16'/8'/4')
Detune Fine and Coarse
Range 16'/8'/4'
Volume half or full

Noise generator pink noise wih level control

Dynamic ADSR Attack, decay, sutain and release
Destinations: VCA and/or VCF and Off.
Dynamics destination ADSR

Cutoff, resonance, keyboard tracking on/off, ADSR amount.

LFO 1-2 Initial level, speed, destionation LFO 1: DCO A on/off
Destinations LFO 2: DCO B on/off

LFO 3 Wafeform saw and square, initial depth and speed control.
Destinations: DCO A and B with both PWM on or off.
VCF on/off.

Control wheels Version 1 has only modulation wheel, later version two.
Destinations: Pitch DCO A and/or DCO B, on/off.
Final depth LFO 1/2 and/or 3.

Patch control load/save/free panel.

Master Volume

Master Tune

On the back you find midi in/out. Tape load to and from. Pedal control for VCA and VCF.

Dimensions 94 x 39,5 x 18,5 (LxWxH)

Weight 14,5 KG

Picture gallery (Press image for larger image)

All pictures are from version 3




6 SSM2024
2 SSM2031
6 SSM2044 VCF
6 SSM2056 EG

WARNING: CHECK the condition of your battery. It can kill your synth if it leaks!!!!
It will eat tracks on the processor board. If you got no sounds and alls led's are burning
you're too late.  Even if the battery still looks fine, it's better that you replace it already.
But first make a backup of all your sounds!!!!.


The complete service manual. 32 pages of info and schematics. All in one PDF file

Update, new version online, high quality this time.

Go to downloadpage    Thanks to Greg Montalbano! And also my brother for scanning

If some details are not readable anymore, then let me know and I can send you some pages of better quality.

Siel Opera 6 patches

This textfile contains all the patches taken from the Opera 6 patch sticker.



I don't know if it works. So please make a BACKUP before trying
You should load them into your synth using the Tape input.

 Patchdump.zip    Thanks to Martin Gson


Jean Jacques Kravetz in action, using a Opera 6,
a Hammond and four Siel Expanders!!


Good Opera 6 / Kiwi review with sounds and pictures.

Restoring an Opera 6. Including schematics and manual!