Astra Turbo Quasar is a dual phase distortion synthesizer designed to alter the harmonic content of a carrier waveform through modulation by a secondary waveform. This unique approach enables the creation of rich, evolving sounds ideal for spacey pads, synth keys, leads, atmospheric textures, and ambient soundscapes. The instrument features two phase distortion oscillators, each offering 16 distinct single-cycle waveforms, allowing for dynamic sound shaping. Its waveshaper section provides a selection of basic and resonant waveforms, granting independent control over left and right audio channels to craft complex stereo effects.

The synthesizer includes a four-stage ADSR envelope generator that offers precise control over attack, decay, sustain, and release parameters, enhancing expressiveness and shaping of the sound. A state variable filter allows smooth tone modulation with selectable lowpass, highpass, bandpass, and band-rejection modes, helping to color the sound source effectively. Additionally, the low-frequency oscillator (LFO) introduces modulation effects such as vibrato and tremolo, while built-in reverb and dual delay effects contribute to spatial depth and a wider stereo image. These features combine to provide extensive control over tonal dynamics and ambiance.

Astra Turbo Quasar supports monophonic mode with adjustable glide for smooth pitch transitions, making it suitable for expressive lead lines. MIDI automation is implemented for seamless integration with external hardware and DAWs, enhancing workflow and creative possibilities. The preset manager offers convenient loading, saving, and exporting of presets in multiple formats, including VST2, VST3, and Audio Unit presets. With 30 ready-to-use presets, this synthesizer caters to both beginners and advanced users seeking innovative sound design capabilities.