The engine of OP-X PRO-II exactly clones the technical structure of real analog voltage controlled polyphonic synths of the 80s, which were based on separate discrete circuits for each voice, which were slightly varying in sound by default because of device tolerances, and could be tuned globally by adding an offset voltage (auto-tune) or individually by adjusting trimpots on the circuit boards. All of this is implemented in OP-X PRO-II too. Which means: The single voices in fact are discrete separate mono-synths (no voice-cloning!) which slightly vary in sound by default (untuned), but can be quickly tuned or again de-tuned globally (also seamlessly if needed) by the click of dedicated buttons (imitating auto-tune) for different parameter groups. Virtual trimpots (imitating the calibration trimpots on the voice-boards) finally also allow to tune pairs of voices individually to achieve a custom detuning if needed.

General Features:
12 tunable voices (virtual voice-boards) in 2 voice-banks.
2 Oscillators per voice (saw, pulse, sine).
FM, hard sync, ring mod, pw modulation.
Morphable multimode filter (lp12/24, hp, bp, no).
Switchable filter self oscillation.
2 LFOs (main, lever).
LFO 1 waveforms: sine, square, saw, triangle, sample&hold, sampled vibrato.
LFO 1 features: delay, note trigger, free phase adjustment.
2 ADSRs (Filter, Amp).
ADSR 1: invertable, routable to pitch and pulse width.
ADSR 2: switchable attack (lin/log), routable to ring mod.
Stacked unison with variable amount of voices and spread control.
Switchable legato or retrigger (uni/poly).
Polyphonic portamento with switchable spread and detuning.
Arpeggiator offering 32 modes.
Chord hold, sequencer, double mode.
Built in effects processor (reverb/delay) offering presets.
Switchable dual engine effects processing.
LFO, effects and arpeggiator syncable to song tempo.
32 wheel modes, mod to cutoff, asymetric bending.
MIDI learn & relative or fetched CC processing.
CC remote patch switching.
Arpeggio hold and sequencer start/stop switchable by damper pedal.
Separate Voice Design (SVD).
Switchable master polyphony (6/8/12).
Deactivatable voices.
Individual Pan control per voice channel.
Panning modulation.
Global tuning options (OSC/FILT/ENV/POR).
Tuning trimpots per voice channel for custom tunings.
Built in patch browser with patch change smoother.
2500 built in presets.
Includes many famous 80s sounds.
2 interface types (synth/rack) each in 3 sizes (standard/large/huge).

home page: https://www.sonicprojects.ch/opxpro2/description.html

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