Spire is a polyphonic software synthesizer that merges the best features of both software and hardware synths into a single powerful instrument. Its sound engine offers a wide range of modulation options and a flexible architecture, ensuring deep sound design capabilities. The user interface is designed for ease of use, providing smooth navigation and quick access to essential controls, making it suitable for producers at any skill level.

The synthesizer features four multimode polymorphing oscillators capable of producing classic, noise, FM, AMSync, SawPWM, HardFM, and vowel sounds. Each oscillator supports nine unison voices, allowing complex layering and thickening of sounds by spreading voices across chords and octaves. Spire’s dual multimode filters combine analog and digital filtering types with various filter modes, delivering rich and dynamic tonal shaping.

Spire includes a high-quality effects processor with tools such as shaper, decimator, phaser, chorus, delay, and reverb. Its modulation system is highly flexible, featuring multiple envelopes, LFOs with morphing shapes, macros, and an extensive modulation matrix. Additional tools like steppers and an arpeggiator enhance creativity, while a multiband compressor and three-band EQ help to fatten and polish the sound, making Spire a comprehensive solution for modern music production.