Double Six XXL is a 6-operator FM synthesizer offering a rich palette of sounds through 32 classic DX7 algorithms and 16 additional 4-operator configurations. Each operator features its own customizable envelope with up to 8 stages and adjustable sustain points, allowing for precise shaping of tones. Operators include effects such as clipping, overdrive, lowpass filtering, and distortion, enhancing the sonic possibilities. The synth also provides 11 waveforms and flexible pitch controls, including octave range, fine-tuning, and pulse width modulation.

This instrument includes advanced modulation options with 3 LFOs offering 19 waveform shapes and multiple BPM-synced rates, capable of modulating pitch, phase, and filter cutoff. The LFOs can trigger in various modes to suit different playing styles or sequencing needs. Additionally, the synth integrates 4 envelopes with BPM-based retriggering and 14 curve shapes for nuanced expression. A variety of filter types are available, ranging from multiple low-pass filters to band-pass and notch filters, enabling detailed tonal sculpting.

Double Six XXL also features two-octave sequencers and a note sequencer that enhance rhythmic and melodic creativity. Its effects section includes chorus, stereo delay, phaser, gater, and various distortion effects to add depth and character. User-friendly functions such as an EZ preset system simplify sound design by allowing quick resets and uniform adjustments across operators. Velocity and polyphony controls provide additional performance flexibility, making this synth a powerful tool for both studio production and live use.