Artium Instruments The Doppler 2-Operator FM Desktop Synthesizer

The Doppler is a polyphonic, 2-operator FM synthesizer with a unique approach to sculpting, tweakability, and has 8-note polyphony. It's designed for sonic exploration, where every knob twist reveals a new sound that's uniquely your own.

Ultra-tweakability is at the core of the Doppler. It features a single, powerful algorithm, but the magic happens when you start adjusting its parameters. Even the subtlest tweaks lead to big shifts in the overall sound, making every turn feel like a discovery.

At the heart of the Doppler are two sine waves that form the foundation of its sound. The modulator wave is quantized and can modulate both the carrier's phase and frequency—or both at once for even more complexity. The carrier wave can even be sent through a feedback loop to modulate itself. Plus, there's a 9-octave pink noise source to modulate the carrier, adding texture and a lo-fi grit.

The modulator sine wave features two rotary switches that control its frequency through a quantized octave and semitone shift. The Octave rotary switch offers a 5 octave range, allowing you to go two octaves above and two octaves below the carrier’s frequency. The Semitone rotary switch gives you a 12-semitone range, from the base note up to 11 semitones above. Both switches click into place and are perfectly quantized in relation to the carrier's frequency.

The Doppler features a standard ADSR envelope, but there are a couple of cool nuances that really enhance its functionality. By default, the ADSR envelope only affects the carrier wave. However, when you flip the Env Mod toggle on, the envelope also influences the amount of frequency modulation applied to the carrier. On top of that, the Mod Trail knob lengthens the attack value, but only on the modulator wave. This gives you the ability to make the modulation swell in, adding an extra layer of depth.

All onboard effects can be used with other music equipment. Simply plug an external audio source into the rear input jacks, and The Doppler will seamlessly mix the external audio with its synth core, allowing for simultaneous processing of both signals.

The Doppler delay is a tap-tempo digital delay with just a subtle touch of warmth. The delay length syncs with an internal clock, which you can set by tapping the red piezoelectric touchpad.

The reverb in the Doppler is crafted to enhance the natural body and ambiance of the synth without overwhelming it. It's the same rich, organic reverb found in The Swarm, now with expanded control over both the level and feedback. This stereo reverb lets you move seamlessly from subtle room or hall effects to expansive, cathedral-like soundscapes, opening up a world of atmospheric possibilities.