What RoEx Learned From 7 Million Tracks

RoEx has processed over 7 million audio tracks through Mix Check Studio, Automix and integrations of audio tools into leading music and entertainment platforms.

That is a significant body of data - and it tells a consistent story about where independent music goes wrong before release, and where it goes right.

This is a breakdown of what that data actually shows.

The dataset

The analysis draws from tracks submitted to Mix Check Studio across more than 180 countries. The tracks span 30 genres. The top five by volume are Electronic (15.7%), Hip Hop and Grime (14.5%), Rock (9.6%), Pop (9.6%) and House (7.0%).

The findings were detailed in a peer-reviewed paper presented at the Audio Engineering Society 157th Convention in New York - "Exploring trends in audio mixes and masters: Insights from a dataset analysis."

Finding 1: Most tracks are not release-ready

The headline finding is straightforward. The majority of tracks submitted to Mix Check Studio had at least one measurable issue that would affect how they sound on streaming platforms. Not every track had a critical problem - but most had something worth addressing before distribution.

This is not a criticism of independent producers. Mixing and mastering are technical disciplines that take years to develop, and most independent artists are primarily focused on writing and recording. The gap between finishing a track and having it sound competitive on streaming is real - and it is fixable.

Finding 2: 46% of mixes are undercompressed

Nearly half of all mixes showed signs of undercompression - the dynamic range is too wide, making quiet parts too quiet and loud parts too loud without the cohesion that makes a mix feel like it holds together.

Undercompression sounds fine in isolation but falls apart in a playlist context, where it sits alongside professionally mixed tracks. It is also the problem most commonly misdiagnosed as a mastering issue. No mastering tool fixes a mix that has not been properly compressed at the stem level - mastering works on the finished stereo file, not on individual elements.

Automix addresses this at the stem level. Because it processes each element individually before combining them, compression decisions are made per instrument - the vocal, the drums, the bass - rather than applied across an already-bounced mix.

Finding 3: 79% of mastered tracks are too loud for Spotify

This is the finding that surprises most people. 79% of mastered tracks in the dataset exceeded Spotify's recommended loudness level of -14 LUFS. 92% exceeded Apple Music's recommendation of -16 LUFS.

The consequence is automatic. Streaming platforms turn the track down - and the heavy limiting applied to achieve that loudness becomes audible as distortion, pumping and a loss of dynamic range. The track sounds squashed on every platform that normalises, which is all of them.

The fix is to target -14 LUFS integrated when mastering for streaming and use a true peak limiter set to -1dBTP. Run your finished master through Mix Check Studio before submitting to a distributor. The loudness reading tells you exactly where you stand.

Finding 4: Clipping affects 31% of mixes and 57% of masters

Nearly a third of all mixes showed some form of clipping - audio signal exceeding the maximum level the system can handle, causing distortion. In mastered tracks that number jumped to 57%. More than half of all mastered tracks in the dataset were clipping.

The primary cause is the push for loudness. Exceeding the ceiling to compete with other tracks bakes distortion into the file permanently. Once a master is clipping, it cannot be removed.

Mix Check Studio flags true peak clipping instantly. If your master is clipping, go back to the mix stage, reduce the output level before the limiter, and remaster. A true peak ceiling of -1dBTP is the standard for streaming delivery.

Finding 5: Phase issues affect 16% of mixes - and most producers never check

Phase issues occur when elements in a stereo mix are out of sync, causing frequency cancellation in mono playback. The result is a mix that sounds full in stereo but loses low end, vocal presence or separation on phone speakers, Bluetooth devices and club systems.

16% of mixes and 15% of mastered tracks showed phase issues. The fact the rate stays consistent through to the mastered version - rather than improving - suggests most producers are not catching phase problems at the mix stage.

The mono compatibility check in Mix Check Studio identifies phase issues before they reach a distributor. The most common cause is heavy stereo widening on bass-heavy elements - sub frequencies should always be kept in mono.

Finding 6: 17% of mixes have mono compatibility problems

Related to but distinct from phase issues, mono compatibility problems affect 17% of mixes and 12% of mastered tracks. Even after mastering, mono compatibility issues persist in a significant number of tracks - meaning the mastering stage is not catching or fixing them.

This matters because phone speakers, most Bluetooth devices, smart speakers and club PA systems all play in mono or near-mono. A track that sounds balanced in stereo can lose its most important elements entirely on these systems.

Finding 7: Tonal balance problems are genre-specific

The data shows clear patterns by genre. Electronic genres consistently showed exaggerated bass - too much low-end energy relative to the midrange and highs. Acoustic and folk genres showed the opposite: insufficient low-end presence that made them sound thin on consumer speakers.

Mastering cannot fix tonal balance problems that exist at the mix level. A high-pass filter on a master cannot remove bass embedded in every element of the arrangement. The fix happens at the stem level - which is why Automix produces results on these specific problems that stereo mastering tools cannot match.

What this means in practice

Seven million tracks is a meaningful sample across 30 genres and 180 countries. The patterns are consistent enough to say with confidence that these are not edge cases, but the normal experience of independent music production.

All of these problems are detectable before you distribute. Mix Check Studio catches loudness, clipping, phase and tonal balance issues in under a minute - free, no account needed. If the analysis flags a mix-level problem, Automix addresses it at the stem level before mastering. If it flags a problem with an already-mastered stereo file, Mastering+ can improve it without needing the original session.

Frequently asked questions

Where does this data come from?

The analysis draws from over 7 million tracks submitted to Mix Check Studio across more than 180 countries, spanning 30 genres. The findings were detailed in a peer-reviewed paper presented at the Audio Engineering Society 157th Convention in New York.

Does this mean most independent music sounds bad?

No. These are technical measurements, not artistic judgments. A track can have a loudness problem and still be a great song. The point is that fixable technical issues are affecting how music sounds on streaming platforms - and most go undetected before release.

How does Automix use these findings?

The research directly informs how Automix processes audio. The most common problems identified - under-compression, loudness issues, tonal imbalance, phase problems - are the specific areas where Automix's stem-level processing is designed to make improvements.

What genres had the most problems?

Electronic music (15.7% of the dataset) consistently showed exaggerated bass and loudness issues. Hip Hop and Grime (14.5%) showed the highest rates of clipping. Acoustic and folk genres showed the most tonal balance issues, specifically insufficient low-end presence.