Synth DB

The Ultimate Synthesizer Database


Total list currently 2405 items in 330 Brands

Siel | Opera 6 v3


The Opera 6 is a classic, early eighties analog 6-voice polyphonic synthesizer that was in the same class as the Roland Juno series.

The Opera 6 came in three versions as it was developing during its lifetime. First there was a totally analog version with an Oberheim-style pin-stripe control panel and one modulation wheel. A matrix of push-buttons enabled program selection. The later versions replaced the VCOs with DCOs. This meant more stable tuning without compromising the analog sound. Then, MIDI was also added (with velocity response ability). Also onboard the Opera were 3 LFOs for lots of modulation and effects. Its design was intuitive, but quirky - ie: the Pitch/Mod wheels are far away from the keyboard.

It's great for swooshy pads, analog strings, and analog effects. Bass is OK, brass is "iffy", lead sounds are pretty weak as well are percussive/noise sounds and effects. Unfortunately, there are no effects, not even a Chorus to thicken up your sounds. MIDI is 1-part multitimbral and always in OMNI mode, so it's quite limited. But the velocity responsiveness can control the VCF or ADSR. In the end it makes a nice piece of collector's kit and can offer some unique analog pads and sounds.

Version 1 of the Opera 6 from Siel featured 6 voices with 12 Voltage Controlled Oscillators. The oscillators featured square and saw waveforms and pulse width modulation. Backups could be performed over tape backup is available.

Version 2 of the Opera 6 from Siel featured 6 voices with 12 Voltage Controlled Oscillators and is very similar in look and style as the original with a new blue casing, pitch and mod wheels, and repositioned buttons allowing more space for the user to perform functions. The synthesizer's architecture is still a 6 voice unit with 12 voltage controlled featuring square and saw waveforms with pulse width modulation. The Opera 6 V2 has MIDI note on/off with velocity and program change only. Backups could be performed over MIDI as well and also tape backup is available. A pitch wheel was added alongside the original's mod single wheel.

Version 3 of the Opera 6 from Siel features 6 voices with 12 Digitally Controlled Oscillators and is very similar in look and style as the original and Version 2. This time still with blue casing, and pitch and mod wheels, but without the two buttons between them found on Version 2. The newest and biggest change was the unit now featured 12 Digitally Controlled Oscillators. The instrument still offered 6 voices.

ModelOpera 6 v3
Engine TypeAnalog
Voices (max)6
LFO3 LFO 1-2 Initial level, speed, destination LFO 1: DCO A on/off Destinations LFO 2: DCO B on/off LFO 3 Waveform saw and square, initial depth and speed control. Destinations: DCO A and B with both PWM on or off. VCF on/off.
Engine Detailed2 DCO's per voice, Pink Noise, Pulse, Pulse Variable, Saw Down, Saw Up, Square
Filter (VCF)SSM analog with resonance and ADSR
Envelope (VCA)ADSR
Memory95 Programs
Key typeKeys
Produced:1985 - 1986
Legend: Obvious Y: Yes, N: No, N/A: Not Applicable
VCO Voltage Controlled Oscillator DCO Digital Controlled Oscillator
LFO Low Frequency Oscillator Sub Sub Oscillator
VCF Voltage Controlled Filter VCA Voltage Controlled Amplifier
Velocity As with a piano, the harder you hit a key, the louder the sound, unlike most organs which always produce the same loudness no matter how hard you hit a key. Aftertouch Pressing a key after you activated it. Channel Aftertouch, no matter which key, it will send a Channel message. Poly Aftertouch, sends the pressure per key instead of the whole channel.
Values for OSC, LFO, Filter, Envelope are per voice unless stated otherwise.

Manuals, patches etc.


If you like to discuss or talk about synths in all forms (including VST and modular), you are welcome to join the Facebook group "The Hard, The Soft and The Modular".

My music

Interested in music from "Synthisfactory" or "SX Instrumentals"?

Visit our website.

Contact Us

Did you find an error in the info or do you have an item to list? Go to the Contribution page, fill out the form and I'll see what I can do.