Unlock the full potential of 16 voice synthesis and 8 oscillators per voice with the ASM LSKB Leviasynth Keyboard and elevate every sound you create.

From the depths of the sonic seas a new monster rears its head: Leviasynth®.

Leviasynth® is a 16-voice, 8-oscillator algorithmic synthesizer with analog filters.

From the beginning ASM has strived to create synthesizers that challenge the status quo. Leviasynth® continues this tradition, elevating both studio and stage with a solid steel chassis, enhanced Polytouch® polyphonic aftertouch keybed, and an all-new hybrid digital / analog synthesis engine. Leviasynth is an unflinching masterpiece of sonic potential. The 8 oscillators, 13 envelopes, 5 LFOs, 18 digital filter modes, and 4-pole analog low pass filters inspire creativity and live performances. Flexibility abounds, with two layers of synthesis that can be stacked or split, the ability to pair voices into binaural stereo mode with independent modulation of carrier and modulator signals, as well as various voice allocation modes. All this paired with the onboard 3-track sequencer and powerfully flexible arpeggiator, Leviasynth takes you to the depths of synthesis like never before. From thundering bass to cutting leads, screaming organs to bombastic brass, warm keys to elevated ambience, Leviasynth surges forth.

Sound Generation
With an all-new 16-voice digital / analog hybrid synthesis engine, Leviasynth® takes a unique approach by providing 8 oscillators with over 300 waveforms available, as well as a range of unique synthesis types including Phase Modulation, Linear Frequency Modulation, Pulse Width Modulation, HTE Sync, and three types of Phase Distortion. It is capable of 16 voices that can be split and layered in two parts and has the ability to combine voices into stereo binaural voices. The 8 oscillators and 7 synthesis types can then be arranged using one of over 140 preset algorithmic combinations. You can also craft your own custom algorithm and store it in the patch. If this didn't offer enough options, we also feature Algorithm morphing which lets you select 8 algorithms, place them in any order and modulate smoothly between them. This uniquely powerful sound generator is then fed into the powerful Hydrasynth digital filter section, which includes 18 digital filter models as well as morphing and digital drive. From there the sound is further sculpted by a custom analog variable pre-drive circuit for intense analog warmth, before passing into the pure analog, 4-pole resonant filter. This is hybrid synthesis like you have never heard before.

Modulation
Synthesis is all about movement of sound…and Leviasynth® moves like a serpent through water. It inspires creativity with a staggering 13 Envelopes, 5 LFOs, a 32-point modulation matrix, and a host of dedicated modulation routings for easy access. Leviasynth features 42 internal modulation sources and over 290 modulation destinations in total (not including MIDI CCs and external CV modulation). Each oscillator features its own dedicated 6-stage DAHDSR envelope, with looping, BPM-syncable stages, multiple trigger sources and quantizing. LFOs feature multiple waveshapes including sample and hold, noise, and a custom "Step LFO" mode that allows LFOs to double as independent step sequencers or custom waveshapes. Both Envelopes and LFOs feature fast and slow modes, enabling exceptionally wide timing of modulation rates. Our VoiceMod section allows for each voice to have its own offset which can be used as a modulation source. Additionally, 8 Macros per part, each with 8 individually assignable sources, are available for immediate control. ASM's patented Polytouch® keybed has dedicated routings throughout the engine for immediately responsive modulation per note, as well as the ability to be assigned in the modulation matrix.

Voice and Effects
In the Voice section Leviasynth® gives you control over quite a few parameters, which makes it possible to truly shape the character of the synth to your liking.

Vintage mode increases modulation depth while dropping modulator resolution for a more classic, glassy tone. Bit depth lets you take the synth from clean and classy to dirty and raw. Turning Snap off gives you the character of the Leviasynth's VCA, while enabling Snap gives you the sub-millisecond timing of a DCA.

OSC Stereo mode pairs voices into binaural oscillator and filter sets, extending into the synthesis algorithms with independent panning for modulators, carriers, or both.

Analog Feel allows for subtle per-voice modulations at the twist of a knob, enabling a moving vibrancy of sound from clean and sharp to drifting and dirty.

Multiple Polyphony modes - including mono, unison, and polyphonic unison - with Voice Limiting, Unison Detune, and Panning Rotation modes, provide flexible stacking and performance options, while Glide and Glissando (distance and time modes) support expressive playing techniques.

Leviasynth® features 4 effects processors per part that can be used at one time, featuring 18 digital effects ranging from modulation effects to distortions, delays, reverbs and more.

Performance
Leviasynth is available in both keyboard and desktop/rack/VESA configurations. The keyboard model features an enhanced semi-weighted 61-key Polytouch® keybed with polyphonic aftertouch, along with note-on and note-off velocity for detailed performance control. A 4-octave ribbon controller offers multiple expressive performance modes, and illuminated pitch and modulation wheels deliver a tactile and responsive control. The desktop/rack/VESA version replaces the keyboard with 16 Polytouch®-enabled pads, providing an equally expressive alternative in a compact form factor.

Both versions include a full-color touchscreen for intuitive editing and clear visual feedback. For note and pattern generation, Leviasynth offers a versatile eight-mode arpeggiator with Ratchet, Chance, and Entropy Shuffle functions, alongside a three-track sequencer featuring Drift and Probability controls. The arpeggiator and sequencer can operate independently or interact with each other, supported by dedicated performance controls. Many parameters in the sequencer and arpeggiator can even be modulation destinations, allowing them to be manipulated in real-time.

Dedicated hands-on control over both digital and analog filters, along with a unique capacitive-touch Envelope Bias control section, deliver immediate response and expressive, performance-focused shaping.

Patch Management
ASM Manager - Total Patch Control

Patch management is essential to keeping Leviasynth® organized and performance-ready. ASM Manager lets you quickly arrange preset banks and favorites, safely back up or restore your entire Leviasynth memory, and perform device updates.

Using a high-speed transfer protocol, ASM Manager can back up or restore the full instrument and transfer patches in seconds. Export preset lists, sort patches by number, name, designer, category, or patch color, and easily rename, rearrange, or move patches and banks with a single click. Create new banks or import patch libraries to expand your sound palette effortlessly.

Specifcations

Architecture

• 16 voices with 8 oscillators per voice
• Algorithmic synthesis engine with morphing
• Analog filter, hybrid digital / analog signal path

Oscillators

• Oscillator modes: Phase Modulation (PM), Frequency Modulation (FM), Pulse Width Modulation (PW), HTE Sync, Phase Distortion (3 types)
• Over 300 waveforms and 140+ preset algorithms
• Custom Algorithm mode for user-defined routing

Filters

• Digital filter (18 models including morphing multimode and vowel)
• Analog 4-pole low pass filter
• Analog filter includes pre-drive saturation, self-oscillation and Q compensation

Modulation

• 32-slot Modulation Matrix
• 170 total sources
• Over 425 total destinations
• 5 LFOs - Sine, Tri, Saw, Ramp, Square, Random, Noise, and Step
• 13 DAHDSR envelopes with looping, BPM sync modes and more
• 8 Macros per patch

Performance Controls

• 61-key semi weighted Polytouch® keybed with polyphonic aftertouch
• 4 octave Ribbon controller with multiple modes
• Chord mode, Octave buttons, and Glide
• Dedicated Digital and Analog filter controls
• Innovative Envelope Bias controls for intuitive patch adjustment

Arpeggiator & Sequencer

• Arpeggiator: 8 modes with Ratchet, Chance, Entropy
• Dedicated controls for Mode, Octave, Gate and Entropy
• Sequencer: 2 polyphonic note tracks + 1 Macro automation track
• Up to 128 steps per track with probability and drift options
• Parameters can be modulation destinations in the modulation matrix

Effects

• Pre/Post FX: Chorus, Flanger, Rotary, Phaser, Lo-Fi, Tremolo, EQ, Compressor, Distortion
• 5 delay types with tempo sync
• 4 reverb types with up to 90s decay and Freeze

Patches

• Single mode: 8 banks × 128 patches
• Multi mode: 5 Banks × 128 Multi patches
• Favorites system and randomization options

Connectivity

• MIDI In/Out/Thru DIN & USB-B (class-compliant)
• CV Pitch, Gate & Clock with 2 Mod inputs and 2 Mod outputs
• TRS Balanced outputs
• Dual headphone jacks 3.5mm & 1/4"
• Sustain and expression pedal inputs
• ASM Manager patch management and backup

Hardware

• Tour-ready metal chassis
• Backlit wheels and touch-responsive display
• Single/Multi mode buttons and Upper/Lower part selection

Key Specifications

• 16 voices; 8 oscillators per voice
• 300+ waveforms
• 140+ algorithms with Custom Algorithm mode
• Dual filters: Digital (18 Models) + Analog 4-pole with pre-drive
• FX suite: Pre/Post FX, Delays, Reverbs
• Full connectivity: MIDI, USB, CV/Gate, audio outputs