Two oscillators with 4 selectable waveforms, Triangle, Saw, Square, Pulse and its dedicated PWM and Ring modulator mode. Additionally, the Triangle and Sawtooth waveforms have PWM modes. Several waveforms can be selected simultaneously for each of the oscillators.
One multimode filter based on the CEM 3320 chip emulation, providing Self oscillating 12 dB and 24 dB low pass, 6 and 12 dB band pass, and 12 dB high pass modes.
Four D-ADSR: an enhanced standard ADSR envelope with a MIDI syncable delay.
Four LFOs, including two never-seen LFO types.
Four embedded effects: Delay, Chorus, Phaser, Dual EQs.
One Multi-track sequencer.
Several playing modes including A la Moog mono modes and several Polyphonic modes.
The Chaox: an LFO based on fully calculated chaotics functions.
The Rhythm: an LFO that uses the Rhythm for its main purpose.
Guitar modes, Circular and random polyphonic modes.
Syn'X is multi-layer and has a poly-timbral mode:
8 totally independent layers (each layer can have its own set of oscillators, filters, envelopes, glide and LFOs, with independent settings).
2 keyboards, each with its own independent arpeggiator and MIDI settings management.
My review lacks specific details, but I must assert that to my ears: XILS-Labs' Synthix and U-HE's DIVA are the finest software-based analog emulations to date. This is not to argue with there being many other analog e-mu's on the market that meet aspects of a Gold Standard, but as of late 2011/early 2012, I have not heard any soft synth that come closer to truly emulating an analog synthesizer. And to me, That's what it's really all about: The SOUND. Yes, admittedly, there are issues with Synthix that make it's present incarnation less then perfect; primarily a somewhat sluggish GUI running in some environments (keep in mind that I'm evaluating a 1.0 release) to not-so-positive comments regarding the front panel-whilst the first issue will probably soon be resolved (XILS-Labs is deadly-serious about all aspects of their work-I know this from being a license holder of both their XILS 3 Full as well as their brilliant Polykb), the second concern may be regarded as one of personal taste-the front panel/layout/etc. poses no obstacle to me getting work done.