PolyM

XILS Lab's PolyM is a software emulation of a divided-down polyphonic synthesizer architecture, meticulously reverse-engineered from a classic 1970s design. Rather than generating oscillators independently for each voice, PolyM uses top-octave divider technology: a master oscillator produces a high-frequency tone that's divided into twelve equal intervals, then further divided to create multiple octaves. Each voice selects from these divided outputs, allowing genuine polyphony with a distinctly unified, organic character absent from conventional VCO-based instruments.

The sonic signature stems from the architecture's inherent constraints. A Moog 24dB ladder filter with self-resonance and zero-delay feedback processes all voices together, while an acoustic filter bank and resonator section add harmonic coloration that feels rooted in physical space. Per-note pulse width modulation on the oscillators provides subtle timbral variation across the keyboard. The result excels at warm string sections, thick pads, and vocal textures that possess a cohesive, almost warm-blooded quality.

Beyond faithful recreation, XILS Lab exposed previously inaccessible parameters and added tools the original lacked: a dedicated ADSR envelope, multiple LFO shapes, and vintage-style effects. The arpeggiator in version 1.5 includes modulation capabilities that extend beyond simple sequencing.

PolyM targets producers seeking a specific vintage synthesis palette rather than universal flexibility. It's particularly suited to electronic music, synthwave, and contemporary composition where that divided-down character becomes an essential element rather than a nostalgic reference. Among similar emulations, it remains technically rigorous and sonically distinctive.