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Synth (Analogue / Subtractive) by GForce Software
OB-E Full mode OB-E Zoom mode OB-E Sequencer & Delay OB-E Group mode in Zoom mode
What is it?
Operating System Availability
Operating System Latest Version
License & Installation Method
Instant (Serial Number)
What does this mean?
Important Note
Mac only.
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OB-E is our take on the legendary 8-Voice. More than just an emulation, OB-E offers a unique musical experience. Sounding huge, it takes the iconic Synthesizer Expander Module (SEM) based 8-Voice (a.k.a the EVS) into new sonic territory via a raft of enhancements and additions.

The concept of the 8-Voice is actually very simple; based around a single SEM containing two VCOs with Pulse and Sawtooth waveforms, two ADS Envelope Generators, one LFO, and a magical Multi-Mode Filter. In isolation each SEM is monophonic, but in the 8-Voice, because there are eight SEMs triggered by a polyphonic keyboard, you have a superb eight note polyphonic synthesizer.

While simple at heart, OB-E is, to our knowledge, the first virtual instrument with complete per-voice control. This unique Octaphonic architecture offers fresh and exciting creative possibilities to music producers, composers and sound designers for the first time in the digital realm.


We've painstakingly emulated every section of the synth to ensure sonic authenticity while adding the convenience of software control over those eight SEMs. Mono, Mono Legato Poly, Unison and Split are all available. Add to this a new third oscillator, doubling as an audio rate LFO for each SEM, and a stack of additional performance controls via velocity, polyphonic after-touch and MPE control then you'll begin to understand the depth of musical possibilities OB-E provides.


Programming a polyphonic sound on an original 8-Voice was a daunting mission, OB-E makes it a cinch. Unison Chords a forté. To overcome the arduous task of editing 8 individual SEMs, OB-E provides a number of clearly thought out editing controls such as ZOOM which enlarges the selected SEM placing front and rear panels side by side, GROUP (shown above) which enables a SEM parameter change to be applied to all SEMs at once, and OFFSET which functions as GROUP but retains the relative values of each parameter. There's also a fully resizable user interface. OB-E saves all settings within a Patch but also allows the settings of an individual SEM to be saved as a SEM Preset.


And that's not all! With the original MS-1 sequencer as a starting reference point, we've added an extremely comprehensive and creative 8-step Sequencer (shown on the right above) providing a flexibility and fun-factor unavailable via the original hardware. In keyboard Split mode with the Sequencer routed to Module 8, OB-E provides the ability to create a complete three part soundscape from a single Patch. An all-new routable Stereo Delay provides sonically complimentary effects.


Finally, we've complemented our instrument with 600+ factory patches designed by Dave Spiers and a roster of brilliant sound designers. Even better, each patch has been tagged, categorised and is quickly accessible from OB-E's librarian (arrow navigation friendly).

GForce OB-E plug-in Features:

  • Unique 8-Voice Octaphonic architecture with zero delay feedback filters.
  • An authentic sounding emulation of the 8-Voice.
  • 600 factory Patches designed to fit in a mix, all tagged and categorised.
  • Librarian for easy access to the presets (Arrow Keys Navigation).
  • Resizable UI.
  • Continuous, round-robin mode where each note use a new voice.
  • ZOOM to enlarge an individual SEM placing front and rear panels side by side.
  • Group mode - edit all SEMs at once.
  • Offset mode - edit all SEMs at once retaining relative parameter positions.
  • Lock individual SEMs to prevent any changes, including when changing Patch.
  • Individual SEM Copy/Paste & SEM Preset Save/Load.
  • 150+ Individual SEM Presets.
  • 50+ Individual Sequencer Presets.
  • 2 x VCOs, 2 x ADS, Multimode-filter, Polyphonic Aftertouch enabled.
  • LFO, 3rd VCO doubling as a second LFO.
  • Multiple triggering modes; Polyphonic, Monophonic, Mono Legato, & Unison.
  • Stereo Delay & MIDI Sequencer with Sequencer Lock when changing a Patch.
  • 48 Sequence key scaling options.
  • Volume & Pan per SEM. HRTF for Pan.
  • Global Tuning, Vibrato and Portamento. MIDI CC Control.
  • Upper/Low modules can be Split across the keyboard.
  • Extensive Velocity & Aftertouch modulation.
  • Polyphonic aftertouch and MPE ready.

{See video at top of page}

User Reviews Average user rating of 5.00 from 1 reviewAdd A Review

Reviewed By UrbanEric
March 13, 2021

Really wonderful virtual synth. Fattest sound I have heard from any synth in 30 years - analog or digital, physical or virtual. Expensive for what it is and Mac only no PC version which is not acceptable in this day and age. I expect a windows version and sale pricing in the future or this will be a business failure. But the sound quality is really well done, you can tell the G-Force folks poured a lot of heart and soul into this effort. PluginGuru also unified the patches which make the whole thing just ridiculously awesome. Warning - don't try the demo unless you are prepared to part with @ $200.

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