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ALM / Busy Circuits is a UK-based modular synth manufacturer known for clean design, clever engineering, and modules that quietly become essentials in a Eurorack system. Founded by musician and engineer Matthew Allum, the brand has a reputation for solving real musical problems rather than chasing gimmicks, which is why their modules show up in so many serious, long-term racks.
The range covers everything from rock-solid clocking and sequencing to sampling, modulation, mixing, and performance utilities. ALM modules are typically compact, logically laid out, and designed to work beautifully with other brands as well as with each other. Whether you’re building a tight live performance system or a deep studio rack, ALM Busy Circuits gear is trusted for its reliability, musicality, and thoughtful approach to modular synthesis.
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Eurorack is a modular synthesis format with standardised dimensions, power connections, and signal levels. Eurorack systems are built from individual modules mounted in cases, allowing users to create highly customisable instruments tailored to specific sound design and performance needs.
New Gear is unused and in original condition, supplied as it leaves the manufacturer. It is chosen for guaranteed reliability, full functionality, and the assurance of manufacturer support. For example, buying new ensures access to the latest design revisions, included accessories, and official warranty coverage.
A patch is a saved sound setting that defines how an instrument is configured at a given moment. It stores parameters such as oscillator settings, filters, modulation, and effects, allowing sounds to be recalled instantly. For example, a patch might be created for a specific bass or lead sound and then recalled during a performance or reused across multiple tracks in a studio project.
A patch bay is a routing device that allows audio and control signals to be quickly connected and reconfigured without constantly plugging and unplugging equipment. It centralises connections from instruments, processors, and interfaces, making signal flow clearer and easier to manage. For example, a patch bay can be used in a studio to route a synthesiser through different effects or processors simply by changing patch cables, saving time and keeping setups flexible and organised.
Stereo is a two-channel sound format that uses separate left and right signals to create a sense of width and space. It is used to place sounds across the listening field, making music feel more immersive and detailed. For example, a stereo synth or effect can spread a pad or texture across both channels, giving a track greater depth and separation compared to a mono signal.