XILS 4 by XILS-Lab is a virtual analog modular synthesizer plug-in that emulates a prototype EMS VCS4 synthesizer, which was based on two integrated interlinked, and interacting VCS 3 (Synthi) cores. These cores are coupled with a 256 analog polysequencer as well as a collection of envelopes, LFOs, S&H, a Voltage Processor, a pitch tracker, transient control, an analog chorus with three modes, a delay, a phaser, a spring reverb, and more.
The modular design allows you to achieve more than 1140 possible different connections per patch. More specifically, the synthesizer features 12 aliasing free oscillators grouped in six pairs with WaveShaping, 3*2 hard synchronization modes, +2 additional noise oscillators. It also features two analog multimode filters with non linear and zero delay behaviors and three modes (12/18/24 dB). Four trapezoidal looping envelope generators can be switched to standard ADSR mode and five polyphonic LFOs including a four oscillator LFO that can act at audio rate. A polyphonic ring modulator and a VCA engine further expand the synthesizer's versatility.
The unit can be set to cascade mode wherein synthesizer one can feed the input of synthesizer two's engine. Four independent outputs can be set to feed the stereo bus, each with one analog Lp/Hp filter. It also includes two programmable joystick vector controllers with up to 32+32 modulation targets and the polyphonic sequencer features three independent lines, slew rates, and three recording modes. The sequencer itself can also behave as a modulation source.
Up to six play modes (including unison 2/4/6) are possible such as polyphonic and mono portamento/glissando/legato as well as two different keyboard scaling, polyphonic aftertouch, and VCA handling. The synthesizer includes nearly 700 presets made by world famous sound designers including the XILS 3 Factory library which are organized by a preset database engine with the option of creating your own tags. More than 100 parameters can be mapped to a MIDI controller.
The synthesizer is a software plug-in that works within a host application on Mac OSX 10.3.9 or later in VST, Audio Unit, RTAS (Pro Tools 7.0 or later), and AAX (32 and 64 bits, native) formats. It also works on Windows XP, Vista, and 7 machines in VST, RTAS (Pro Tools 7.0 or later), AAX (32 and 64 bits, native) formats.