Elysia Mpressor Qube

Dynamics control that can become part of the sound

The Elysia Mpressor Qube combines conventional compression with unusually creative envelope controls. Its discrete Class-A circuitry, negative ratios, Anti Log release, Gain Reduction Limiter and THD Boost let you move from focused level control to pronounced rhythmic and textural effects.

The Mpressor Qube houses two Mpressor 500 compressor channels in a powered desktop enclosure. The channels have their own controls, giving you two independent processing paths without buying a separate 500-series chassis.

Establish punch with attack and release

Threshold and ratio determine how strongly the compressor responds, while attack and release shape the movement around a note or hit. Letting more initial attack through can preserve impact; faster attack can bring it into the body of the sound. Release controls how the level recovers.

For a snare, listen to the relationship between the initial crack and the ring afterwards. On bass, check the transition between notes as well as the sustain. The same amount of gain reduction can sound very different with different timing settings.

Auto Fast reacts to short peaks

Auto Fast temporarily shortens the selected attack time when a loud, fast impulse arrives, then returns to the original setting. It is useful when you prefer a slower general response but want the compressor to react more quickly to occasional transients.

Compare the mode with the manual setting alone. It is another way to balance control and movement, rather than a requirement for every source. Watch the gain-reduction display while listening for changes in the leading edge of the sound.

Anti Log release for audible rhythmic effects

The alternative Anti Log curve changes the release behaviour so recovery begins more slowly and then accelerates. This can produce a more conspicuous movement than the standard linear release.

Try it on room microphones, percussion or a loop when compression is intended to be heard. Adjust release against the rhythm and listen to what comes forward between the main hits. If the ambience becomes too dominant, revisit threshold and ratio before assuming a shorter release is the only answer.

Negative ratios go beyond limiting

With a conventional positive ratio, the output still rises as the input increases above threshold, but by less. A negative ratio reverses that relationship: as the input gets louder above threshold, the output can fall.

This creates effects that ordinary levelling cannot produce. Loud accents can be pulled into a radically different relationship with the quieter material, changing the apparent groove and sustain. It is particularly useful as a deliberate treatment for electronic parts, samples or an aggressively processed parallel return.

Set a limit on the gain reduction

The Gain Reduction Limiter restricts the maximum attenuation applied by the compressor. Once that amount is reached, increasing the input does not simply create more and more compression.

This can contain the severity of negative-ratio effects or preserve more movement in louder passages. It is not an output peak limiter: the signal can still exceed the input headroom of the next device, so set make-up gain and recording levels accordingly.

THD Boost adds a separate layer of colour

THD Boost increases harmonic saturation around the gain-control stage. The gain setting influences the amount of colour, while the detector continues to respond to the source dynamics independently of that added saturation.

That distinction gives you room to explore density without treating every tonal change as a new compression setting. On drums or bass, find the useful dynamics first, then compare THD Boost and adjust gain by ear. Match the listening level when judging whether the texture improves the source.

From practical control to an intentional effect

The Mpressor rewards experimentation, but it is also useful with restrained settings. Begin with a clear goal—more sustained bass, a firmer snare, or an exaggerated room sound—and add its specialised functions one at a time. Hardwire bypass provides a direct reference to the incoming signal.

Two channels for different jobs—or a stereo pair

Use one channel on bass and the other on a vocal or drum source, or set both for a stereo signal. Each channel is adjusted separately, so match settings deliberately and listen for image movement when processing stereo material. The compact enclosure makes the pair practical beside a desktop interface or as part of a portable recording rig.