The Relab Maselec MLA-4 is a software recreation of the acclaimed hardware tri-band compressor/expander, developed with Leif Mases. It offers precise multiband dynamics, sidechain linking, spectral balance, and per-band harmonic control for mixing and mastering.
Purpose and Design
The MLA-4 is a tri-band compressor/expander designed for mixing, mastering, and stem processing. It is the first officially endorsed software version of the original hardware, developed with its creator Leif Mases. Unlike typical multiband compressors that can introduce phase issues or tonal imbalance, this plugin aims to provide natural, musical dynamic shaping while preserving mix integrity.
Its core strength lies in combining compression (up to 6:1) and expansion (down to 1:2) on each band, allowing independent or interactive control over low, mid, and high frequencies. This makes it suitable for tasks like taming low-end boom, adding top-end air, or restoring transients in over-processed material without unwanted pumping or dulling.
Key Capabilities
The plugin includes a five-mode sidechain linking system, letting engineers choose from full-band cohesion to independent band operation or intermediate modes where low frequencies can influence mid and high bands. This adaptability helps the compressor respond to the material more naturally, avoiding the one-size-fits-all behavior found in many multiband processors.
Additional tools include Auto Spectral Balance, which automatically applies gain compensation across the three bands to prevent tonal shifts during heavy processing. An Auto Level function offers a choice between preserving the original balance or reshaping it creatively. Per-band THD control allows adding harmonic warmth selectively, such as enriching lows or keeping highs clean.
Workflow and Monitoring
For precise adjustments, the MLA-4 provides per-band solo and left/right cut functions in the software. Solo each band to hear exactly how compression or expansion affects lows, mids, or highs in isolation. Left/right cut lets you focus on a single stereo channel, which is useful for fine-tuning stereo balance during mastering.
These monitoring features extend beyond the original hardware, giving engineers deeper insight into the processing. This helps in making confident, intentional decisions without guesswork, whether refining a mix bus or restoring a crushed stem. The interface is built to streamline the dynamic shaping workflow, reducing the need for constant compensation.
Practical Applications
The MLA-4 is suitable for controlling low-end dynamics without losing impact, enhancing midrange clarity without harshness, and restoring lost transients in over-compressed mixes. It can also help achieve competitive loudness without crushing dynamics, thanks to precise control that prevents limiter distortion and retains musicality.
Typical uses include final mastering, mix bus refinement, and stem processing. By allowing expansion and compression to work together, it can tighten boomy bass while lifting high-end detail, or recover the natural dynamics of a performance. The plugin’s phase-coherent design aims to keep the mix intact while applying dynamic changes.
Key features
- Tri-band compressor and expander with compression up to 6:1 and expansion down to 1:2
- Five-mode sidechain linking system for adaptive dynamic response
- Auto Spectral Balance to prevent tonal shifts during heavy processing
- Per-band THD control for selective harmonic coloration
- Per-band solo and left/right cut for detailed monitoring
- Phase-coherent processing to maintain mix integrity
- Auto Level option to preserve or reshape tonal balance
Best for
Best for mixing and mastering engineers who need precise multiband dynamic control without compromising tonal balance. Ideal for refining a mix bus, applying transparent compression/expansion on stems, or restoring dynamics in over-processed recordings while maintaining depth and musicality.