Moog Subsequent 37 (2017–)

At 16 lbs, it lands on your desk like a declaration—this is analog weight, analog presence, analog intent.

Overview

The Moog Subsequent 37 is a semi-modular analog synthesizer built by Moog Music as a direct evolution of the Sub 37, introduced in 2017. It carries forward the lineage of the classic Model D with an all-analog signal path and a semi-modular architecture that requires no patching to produce sound, yet rewards tinkerers with 32 patch points for deep modular integration. Despite its immediate usability, the synth demands attention—not just for its imposing size and industrial metal case, but for the sheer density of sound it generates. Owners report a fat, classic Moog character, thick in the low end and singing in the highs, with a responsiveness that makes it feel alive under the fingers. However, it’s not without quirks: some users have noted technical issues, including noisy modulation wheels and occasional key responsiveness problems during live performance. In late 2023, Moog Music announced they had suspended production of the standard Subsequent 37, though the CV variant was confirmed to have a limited production run of 2,000 units.

Specifications

Manufacturer	Moog Music
Product type	Semi-modular analog synthesizer
Polyphony	Monophonic (2-note paraphonic)
Oscillators	Two analog oscillators with continuously variable waveshapes (triangle, sawtooth, square/pulse, square sub); Third analog oscillator with a range of LFO to audio rate
Filter	20Hz–20kHz lowpass ladder filter with resonance; Filter can be overdriven
Envelopes	Two analog ADSR envelopes
LFO	One analog LFO with five waveforms (sine, triangle, square, sample & hold, noise)
Modulation	Modulation bus with 11 sources and 15 destinations
Keyboard	37-note keyboard with velocity and aftertouch
Arpeggiator & Sequencer	64-step polyphonic sequencer with up to 6 notes per step; Arpeggiator with multiple modes
Inputs/Outputs	1/4" mono output, 1/4" headphone output, 1/4" CV/gate input, 1/4" audio input, 1/4" expression pedal input, 1/4" sustain pedal input, MIDI In/Out/Thru, USB
Patch Points	32 patch points (20 inputs, 12 outputs) for modular integration
Dimensions	Width: 22.5" (57.2 cm), Depth: 13.5" (34.3 cm), Height: 4.25" (10.8 cm)
Weight	16 lbs (7.26 kg)
Power Supply	Internal, 100–240V, 50–60Hz

Key Features

37-Note Keyboard with Velocity and Aftertouch

The Subsequent 37 features a 37-note keyboard described by Moog as "37 synth keys", with an upgraded keybed noted for improved playability. The action is firm but fluid, with a mechanical precision that encourages expression. Velocity and aftertouch are fully integrated into the modulation matrix, allowing for dynamic articulation—press harder and the sound can swell, distort, or modulate in real time. While not weighted, the keys have a linear responsiveness that suits both stabbing basslines and legato leads. However, some users have reported intermittent key response issues during performance, suggesting potential contact or firmware sensitivity.

Three Analog Oscillators with Audio-Rate Modulation

At the core of the Subsequent 37’s voice architecture are three analog oscillators. The first two offer continuously variable waveshapes—triangle, sawtooth, square/pulse, and a square sub—allowing for smooth transitions between timbres without stepping. This fluidity is a hallmark of Moog’s modern design, enabling evolving textures that feel organic rather than digital. The third oscillator operates from LFO to audio rate, functioning as either a modulation source or a full-fledged tone generator. This flexibility expands the synth’s sonic palette significantly, making it capable of everything from deep sub pulses to aggressive FM-like tones.

20Hz–20kHz Lowpass Ladder Filter with Overdrive

The ladder filter is where the Moog magic crystallizes. Tuned across the full audible spectrum, it delivers the warm, rounded lows and crisp highs that defined the Model D. But the Subsequent 37 goes further—its filter can be overdriven, introducing grit and harmonic complexity when pushed. This overdrive circuit is not an afterthought; it’s a central feature, allowing the synth to shift from pristine to filthy with a twist of the drive knob. The resonance is musical and stable, capable of self-oscillation without instability, making it ideal for leads and effects.

64-Step Polyphonic Sequencer

One of the most praised aspects of the Subsequent 37 is its 64-step polyphonic sequencer. Unlike many monosynths that limit sequencing to single-note lines, this one allows up to six notes per step, enabling rich chords and evolving progressions. The sequencer is intuitive, with dedicated controls for step entry, transposition, and timing. It’s not just a playback tool—it’s a compositional engine, often highlighted as a powerful creative tool. When paired with the arpeggiator, which offers multiple playback modes, it becomes a performance centerpiece.

32 Patch Points for Modular Integration

Despite being a standalone instrument, the Subsequent 37 is deeply modular for modular integration). The semi-modular design means it ships with internal normaling that creates a functional synth out of the box, but patching unlocks new signal paths and modulation routings. With 11 modulation sources and 15 destinations, the possibilities are extensive. Users can route external LFOs, clock sources, or even other synths into the Subsequent 37, making it a hub in a larger setup. The patch points are recessed 3.5mm jacks, standard for Moog’s modern line, and compatible with most Eurorack cables.

High-Powered Headphone Amplifier

The built-in headphone amplifier is described as high-powered, capable of driving high-impedance headphones without external amplification. This is particularly useful for studio monitoring or silent practice. The output is clean and loud, preserving the full frequency response of the synth’s sound. Given the instrument’s emphasis on sonic fidelity, the headphone amp is a necessary counterpart—ensuring what you hear is an accurate representation of the analog signal path.

Historical Context

The Subsequent 37 was introduced in 2017 as the successor to the Sub 37, featuring improved oscillators, filter, and modulation capabilities. It builds upon the design of the Sub 37 Tribute Edition, which was itself an award-winning release. Priced at $1,499 at launch, it occupied a mid-tier position in Moog’s modern lineup, sitting between the semi-modular Mother-32 and Grandmother, and the flagship Matriarch and Moog One. Its release marked a refinement of Moog’s modern analog philosophy—balancing vintage character with contemporary workflow enhancements.

Collectibility & Value

The Subsequent 37 was listed at a retail price of $1,899 as of August 2022, and current market listings show pre-owned units selling around $1,649.95. While no original MSRP documentation is available from the fact sheet, third-party sources confirm the $1,499 launch price. Since Moog has suspended production, the synth has taken on a limited-edition status, potentially increasing its long-term collectibility. However, concerns exist around maintenance—users have reported needing screen replacements and other spare parts, and while third-party replacements (like power cords) are available, official parts post-discontinuation remain undocumented. Factory support is still accessible via Moog’s general troubleshooting page for the Subsequent 37 and Sub 37, which may reassure owners facing technical issues.