ONRI Audio has introduced a mastering processor built by an industrial and UI designer who also mixes and masters. Currently available for macOS (Windows version is planned), REISEI offers spectrum analysis, EQ, dynamics, saturation, stereo imaging and limiting in a single view.
Choosing your own rack of high-end plugins and trying every way to use them is part of the craft’s pleasure. It makes the work feel elevated. Yet more often than not, it feeds both the signal and your judgment with noise: imperceptible waste that quietly clouds the decision.
Mastering asks for less. A few clear moves that make the most of the sound already there, and nothing in between. REISEI keeps only those, in one view.
REISEI’s EQ includes a PARTIAL mode built on additive resynthesis. Rather than applying a filter across a frequency band, it locks onto individual harmonics present in the source and follows them as pitch moves. A tracked partial can be lifted, reduced, or inverted so that it cancels in anti-phase. The process is strictly linear, adding no distortion by design.
The analyser doubles as the control surface: every band, grip and node is manipulated directly on the spectrum, and with a module’s SOLO engaged, touching an element brings that part under the ear. What SOLO isolates is chosen to suit each module.
A UNITY control compensates output to input level so that bypass comparisons are level-matched, and the signal chain — compressor, saturator, EQ and dynamic EQ — can be reordered freely.
REISEI does not switch into a mid/side mode. The signal remains L/R throughout, and a per-band WEIGHT control blends mid or side elements into each move by degree, leaving the stereo image anchored where it was mixed.
Metering follows ITU-R BS.1770-4, with integrated, short-term and momentary loudness, LRA, true peak and PLR, plus streaming targets with an APPLY TARGET utility that sets a rough static gain toward the chosen level — a starting point meant to be finished on the meters, not an automatic matcher.
REISEI is available in VST3 and AU plugin formats for the launch price of $299 USD until August 31st, 2026 (regular $399 USD). A fully unrestricted 14-day trial is available to try the plugin.
More information: ONRI Audio
