Double Six is a powerful 6-operator FM synthesizer designed to provide a rich palette of sounds through its extensive algorithm selection, including 32 classic DX7 algorithms and 16 4-operator variations. Each operator features customizable envelopes with up to eight stages and adjustable sustain points, allowing precise control over sound shaping. The synth also offers individual clippers per operator, fine-tune options, pulse width adjustments, and an octave range spanning from -6 to 3, enabling detailed tonal sculpting.

This synth includes advanced modulation capabilities such as three envelope generators with BPM-synced retrigger modes, three LFOs featuring 19 waveforms and multiple speed settings, and a phase modulation depth control. Its filter section provides five distinct filter types with dedicated envelopes, enhancing sonic flexibility. Users can streamline sound design with the EZ preset feature, which resets fine-tuning, waveforms, octaves, and envelope timings to quickly create new patches. Additionally, the synth incorporates effects like chorus, stereo delay, gater, and phaser to further enrich the audio output.

Double Six supports MIDI Learn for intuitive control mapping and comes with 128 presets plus 32 additional sounds crafted by experts. The inclusion of two octave sequencers, a master volume envelope, and BPM-synced LFOs for operator modulation and filter cutoff make it a comprehensive tool suitable for crafting dynamic and evolving sounds. Its CPU-saving options, such as disabling envelopes, ensure efficient performance while maintaining high-quality synthesis.