General:

• Synthesis method: Subtractive hybrid.
• Each patch contain two 'scenes' which are separate instances of the entire synthesis engine (except effects) that can be used for layering or split patches.
• Category based patch-browser.

Oscillators:

• 3 oscillators/voice.
• 5 versatile oscillator algorithms: Classic, Sinus, Wavetable, S/H Noise and Audio-input.
• The classic oscillator is a morphable pulse/saw/dual-saw oscillator with a sub-oscillator and self-sync.
• Most algorithms (all except sinus and audio-input) offer up to 16-voice unison at the oscillator level.
• Oscillator FM/ring modulation.
• All oscillator algorithms are band-limited yet they still cover the entire audible spectrum.
• Noise generator with variable spectrum.

Filter block:

• Two filter-units (7 different configurations).
• Feedback loop.
• Available filter-algorithms: LP12, LP24, LP24L (ladder filter with 1-4 poles), HP12, HP24, BP, Notch, Comb+, Comb-.
• Waveshaper (5 shapes).

Modulation:

• 12 LFO-units available to each voice (6 are running on each voice and 6 are shared for the scene).
• DAHDSR envelope generators on every LFO-unit.
• 7 deformable LFO-waveforms + 1 drawable/step-sequencer waveform.
• Fast and flexible modulation routing. Almost every continuous parameter can be modulated.

Effects:

• 8 effect units arranged as 2 inserts/scene, 2 sends and 2 master effects.
• 9 algorithms: Delay, Reverb, Chorus, Phaser, EQ, Distortion, Conditioner (EQ, stereo-image control & limiter), Rotary speaker, Frequency shifter.

Surge is available as a VSTi for Windows and costs €/$180. A demo version is available.