Teenage Engineering POM–400 Buyer Guide

Bottom line

Buy POM–400 for the larger fixed patch field.

POM–400 is the larger fixed-architecture POM when three oscillator sources and a bigger patch field are worth assembling. The official US feed showed $359, out of stock and discontinued, on 2026-10-18; it has an internal 16-step sequencer, while standalone POM–16 is separate.

Product shape

Three oscillators and an internal 16-step sequencer.

The official modular page positions POM–400 as the yellow three-oscillator member with patchable fixed modules and an internal 16-step sequencer. That gives it more sound sources than POM–170 without making it an interchangeable modular system; standalone POM–16 is not part of the base-kit assumption.

Comparison ladder

Choose more sources, ready-built flow, or expansion.

Choice	Product	What you gain	What you give up
Smaller POM	POM–170	Choose the single-oscillator kit when footprint and lower complexity matter.	You give up POM–400’s extra oscillator sources and larger patch field.
Target	POM–400	Choose it when three oscillator sources and physical patching are the point.	You accept fixed architecture, kit/reliability history, and discontinued supply.
Ready-built semi-modular	Moog Mother–32	Choose a ready-built instrument with a conventional product workflow and sequencer.	You give up POM–400’s kit build and distinctive fixed panel.
Expandable system	Eurorack modular system	Choose module interchangeability and long-term expansion.	You trade compactness and object simplicity for cost and complexity.

Buying matrix

Where POM–400’s larger panel fits.

Use case	Fit	Why
Patch-learning object	Good with caveats	The panel teaches routing, but the architecture is fixed.
Finished production	Weak	A sampler or workstation is more direct for complete arrangements.
Expandable modular	Weak	Choose Eurorack or semi-modular equipment when growth matters.
Design-led collection	Strong	The physical build and yellow panel are part of the value.

Review signal

Independent reviews explain the tradeoff better than the feature list.

Signal	What it supports	Confidence
Sound On Sound	Sound On Sound describes the POM family’s patching model, fixed module architecture, and early production issues, including the POM-400.	Professional Hands-On Review
Waveform Magazine	Waveform treats POM-400 as an unusually attention-grabbing modular object and focuses on its visual/physical appeal and patching experience.	Professional Review Or Launch-Context Source
r/synthesizers	Synth owners debate POM-400 against semi-modular and Eurorack alternatives; this is anecdotal comparison evidence.	Community Signal; Anecdotal

Mechanism

What the kit includes, and what it does not.

Area	What the sources describe	Buyer consequence
Voice	Three oscillator sources inside a fixed, patchable POM–400 panel.	More sources make it more expressive than POM–170, not more expandable.
Sequencing	Internal 16-step sequencer; standalone POM–16 is separate.	Do not treat POM–16 as an included keyboard or sequencing module.
Assembly	Kit construction, proprietary hardware, patch cables, knobs, modules, and power.	Check component fit, screws, cables, and power on used units; keyboard buttons are not a base POM–400 requirement.
Revision context	Early reviews documented assembly/fit concerns, while the official page documents revised-kit context.	Use the revision and return path to interpret older review complaints.

Decision

Choose POM–400 when patch surface is the point.

Choose POM–400 when the larger fixed patch surface itself is the instrument; choose Mother–32 or Eurorack when immediate or expandable synthesis wins.
Inspect every module, patch cable, knob, and power connection before accepting a used POM–400; do not expect keyboard buttons in the base product.
Standalone POM–16 is separate, so do not infer it from the internal 16-step sequencer.
Read early assembly reports alongside the official revised-kit guidance; do not turn review-era issues into a current failure rate.

Edge cases

Check modules, power, and the separate POM–16 boundary.

Inspect every module, patch cable, knob, and power connection before accepting a used POM–400; do not expect keyboard buttons in the base product.
Standalone POM–16 is separate, so do not infer it from the internal 16-step sequencer.
Read early assembly reports alongside the official revised-kit guidance; do not turn review-era issues into a current failure rate.
The official feed marked POM–400 out of stock and discontinued; no Amazon identity was accepted.

Cheat sheet

POM–400 in one minute.

Question	Answer
Core role	Three-oscillator Pocket Operator Modular synthesizer kit with internal 16-step sequencer
Official US price observation	$359 on 2026-10-18; out of stock and discontinued in the official US feed
Best first buyer	A builder who wants more oscillator sources in a fixed patch object
Main limitation	Fixed architecture, assembly/condition risk, and discontinued supply
Source confidence	Official modular page plus two professional reviews and labeled owner discussion.

Sources

How this guide was built.

Official product, guide, and dated US price-feed sources were checked on 2026-10-18. Professional reviews and labeled owner discussion are identified in the source metadata; their workflow observations are not current offer, reliability, or hands-on claims by this guide. Merchant price, stock, seller, fulfillment, delivery, bundle contents, warranty, and returns remain unverified unless a dated source explicitly says otherwise. As an Amazon Associate, Field Guides may earn from qualifying purchases.

Receipts

Claim table

Where	Claim	Confidence	Source	Caveat
Product shape	POM–400 is the three-oscillator pocket operator modular synthesizer kit in this comparison.	High	Teenage Engineering	The role is an editorial summary of the current official product page; recheck the exact model and variant before buying.
Product shape	The official Pocket Operator Modular page positions POM–400 as the yellow three-oscillator member with an internal 16-step sequencer and patchable fixed modules; standalone POM–16 is a separate product.	High	Teenage Engineering	Manufacturer specifications describe the feature set; they do not guarantee every workflow or host combination.
Buying matrix	The official US feed showed $359 for POM–400 on 2026-10-18; the listed state was out of stock and discontinued in the official US feed.	High	Teenage Engineering	This is an official store observation, not a live Amazon offer or a guarantee that every color, bundle, or seller shares the same state.
Review signal	Sound On Sound describes the POM family’s patching model, fixed module architecture, and early production issues, including the POM-400.	Medium	Sound On Sound	This is an independent review of a specific unit and time; it is not a universal performance guarantee.
Review signal	Waveform treats POM-400 as an unusually attention-grabbing modular object and focuses on its visual/physical appeal and patching experience.	Medium	Waveform Magazine	The review’s sample, firmware, and comparison set may differ from a current unit.
Review signal	Synth owners debate POM-400 against semi-modular and Eurorack alternatives; this is anecdotal comparison evidence.	Medium	r/synthesizers	Community reports are anecdotal and selection-biased; use them to form inspection questions, not failure rates.
Decision	POM–400 makes sense when a larger patching surface and more oscillators in a self-contained modular object; the main tradeoff is fixed architecture, kit-build/reliability history, and competition from truly expandable modular gear.	Medium	Sound On Sound	Fit depends on the reader’s workflow, budget, and tolerance for the stated limitation.
Edge cases	The relevant connection, configuration, and ownership caveats for POM–400 are material to the buying decision: inspect the modules, patch cables, knobs, power, internal 16-step sequencer, and separate status of standalone POM–16 before buying used.	High	Teenage Engineering	Check the current guide and included accessories for the exact revision before purchase.