Waveforms and loops
Locate events with waveforms and zoom. Delimit a loop to repeat the passage and use offsets to align versions with different initial silences.
TRB Audio · Windows
Mastering Player
A professional audio player for critical listening and mix comparison.
Listen to WAV, FLAC, MP3 and AIFF on Windows. Compare up to four versions and reference tracks at the same playback position, with matched levels and audio analysis tools.
See how Mastering Player works.
Complete tour · 5 minutes · English narration
Standard and Pro
The same passage. Four versions to compare.
Load MASTER 1, MASTER 2, PRE-MASTER and REFERENCE. When you move from A to B, C or D, the player maintains the listening point: you can evaluate the same attack, the same phrase or the same section of the song.
Blind test
Hide names and statistics during comparison. You can focus on listening differences without being guided by reference information.
Illustrative images of the tools. The available version is 1.0.7.
LUFS-I or True Peak level matching
Integrated loudness · LUFS-I
Use LUFS-I level matching to compare tracks with less influence from perceived loudness differences. Gain is calculated over the common section of the references after applying offsets and stays constant during playback.
True Peak
Equalizes the level of references based on their maximum True Peak. Tracks above the lowest value are attenuated, so you can compare them to the same peak criterion.
Standard and Pro
Compare tonal profiles
Profiles open in “All tonal profiles”: each track displays its own profile without subtracting a reference.
“Original level” is the default view; RMS normalization remains available. The optional “Difference (reference = zero)” view makes the reference track’s role explicit.
RMS normalization concerns the tonal profile. Reduces the effect of a gain difference and does not normalize all measurements or listening.
Pro · Version 1.0.5
Explore the differences with Analysis Lab.
Organize up to four panels and open dedicated views when you need more space. In version 1.0.5 you can change reference directly from the Lab and return from the comparison to the analysis of the single song.
Eleven tools for analysis
Spectrum analyzer
Frequency energy distribution, with FFT, smoothing and display settings.
The FFT, smoothing and display settings allow you to adapt the spectrum reading. In the offline comparison, the average energy spectrum of the analyzed section is shown; in the A/B/C/D comparison the reference spectra are placed side by side. The overlap instead concerns tonal profiles.
Spatial spectrogram
Relationship between frequency and stereo distribution.
Relates frequency content to stereo distribution. Combine it with the spectrum and mono verification to read the tonal balance and channel behavior together; it does not replace the listening comparison.
Temporal spectrogram
Evolution of spectral content over time.
Show how the spectral content evolves over time. In the analysis of a selection it describes the chosen trait: it is a temporal reading, distinct from the average spectrum which summarizes the energy of the interval.
Precise level
Channel levels in a dedicated view.
It brings together the channel levels in a dedicated panel, useful when you need a separate reading from the meters in the main window. The monitor level remains a listening control and does not change the source measurements.
VU meter
Level trend with the visual response of the two VUs.
Displays the level trend across two VUs. In Live you can follow its movement; in the offline analysis of the interval you see a final frame. It should not be interpreted as an integrated loudness measurement or as an average of the two quadrants.
Loudness meter
Loudness measurements and comparison with available targets.
Place the loudness readings next to the chosen target. When comparing a selection, LUFS-I, LRA and True Peak are recalculated on the selected stretch. The target is used for comparing measurements and does not activate automatic processing of the audio.
Stereo image / vectorscope
Relationship between channels and stereo distribution.
Shows the relationship between channels and the stereo distribution of the signal. The Live view allows you to follow its evolution; Offline analysis shows a final frame, not an average representation of the entire song's stereo geometry.
Oscilloscope
Temporal shape of the two PCM channels.
Represents the temporal shape of the two PCM channels. Use Live to observe its progress while listening. In the offline result the final frame describes an instant of the interval, not all the shapes taken by the signal in the segment.
Loudness history
Evolution of loudness readings.
Reports the evolution of loudness readings over time. It allows you to relate the variations to the sections of the piece; in the analysis of a selection the history concerns the trait analyzed.
Bit / Noise
Statistics and indications on the digital content of the signal.
Collects statistics and indications on the digital content of the analyzed PCM signal. It is an analysis view of the decoded material; it is not presented as certification of the origin or quality of the file.
Overview A/B/C/D
Summary of loaded references.
Summarizes the references loaded in A, B, C and D. Keeps the context of the comparison visible as you work in the lab, along with dedicated views of spectrum, loudness, levels and stereo.
Pro · Live, song and selection
Compare the passage that matters
Analyze the same selected range, such as a chorus, to compare the measurements of the references in that section.
LUFS-I, LRA and True Peak are recalculated for the interval.
How to read Live and analyze offline
Live follows playback. Offline analysis describes the chosen song or section; VU, vectorscope and oscilloscope show a final frame. To observe its movement use Live.
Pro · Comparative report
Bring the comparison into the report
Print or save the interval comparison as a PDF to document differences between references.
Pro · A/B/C/D comparison
The same analysis on your references
Combine the same tool to compare spectrum, loudness and stereo distribution. The new spatial layout adapts the number of columns to the references present and preserves the vertical development of the spectrograms.
Spatial · 4
Spectrum
Loudness
Tools for everyday work
Reference management
Load audio and Remove all: clear the references without deleting the original files.
Listening controls
Check in mono, reverse right channel polarity, attenuate with DIM or mute with MUTE. These controls act on monitoring and leave files intact.
Sessions and notes
Keep references, settings and observations to resume work. The player's main report is distinct from the Lab's comparative report.
Audio formats and output
WAV, FLAC, MP3, AIFF and other formats supported by the player. Stereo PCM path with WASAPI output; Compatibility depends on codec and container.
See requirements →Mastering Player · 1.0.7
What’s new in version 1.0.7
- Fixed manual closing: window dragging no longer intercepts its controls, and the player remains usable.
- Expanded the manual to twenty chapters in all 24 languages, with contents, search and HTML saving.
- Language selector and scrollbars match the player; high-resolution logo with its shadow.
- Fixed the same dragging and button conflict in the diagnostics window.
Mastering Player · 1.0.5
What's new in version 1.0.5
- New update notification with colours and buttons consistent with the player.
- A “Do not show again for 7 days” option, saved in local preferences.
- Manual update checks from About remain available during the postponement period.
- Corrected link to the Italian download page in the notification, About and installer metadata.
- Clearer update area in About; the download page remains available even if the online check fails.
Licenses do not need to be reissued. Trials, updates, offline leases and historical rights remain unchanged.
Choose your edition
Standard
49 €
The entire main window, metering, stereo, Mid/Side, sessions and Mix Check.
Buy StandardPro
99 €
Everything from Standard, plus the eleven Analysis Lab tools.
Buy ProAlready have a license?
Open the customer portal to view your licenses and manage active devices. Use your purchase email address.
Open the licensing portalMetering: loudness, peaks and stereo
Standard and Pro
Metering: loudness, peaks and stereo
File measurements describe the analyzed audio; Live readings follow playback. Monitor volume adjusts your listening level without changing source measurements.
Loudness
- LUFS-I
- Integrated loudness of the song or interval analyzed.
- LUFS-M / S
- Momentary and short-term readings during playback.
- LRA
- Loudness range in the analyzed interval.
Levels and peaks
- Sample Peak
- Maximum value of digital samples.
- True Peak
- Estimation of the peaks of the reconstructed signal, even between samples.
- RMS
- Root-mean-square signal level, distinct from LUFS loudness.
L/R, Mid/Side and correlation
Read the levels of the channels and the center and side components. Δ M−S expresses the difference between Mid and Side. Correlation and stereo imaging help evaluate the relationship between channels along with mono verification.
View L/R and Mid/Side meters
Critical listening, A/B comparison and audio analysis
For audio engineers, producers and recording studios: compare your mix with a reference track, evaluate two master revisions or listen to a passage in a loop. A shared playback position and LUFS-I level matching help you assess differences without relying on volume alone.
Combine listening with loudness and True Peak measurements, tonal profiles and stereo tools. With Pro, explore spectra and spectrograms in the Analysis Lab and save the comparison report as a PDF.
Requirements and frequently asked questions
Standalone software for Windows x64
Requirements and compatibilityWhat changes between Standard and Pro?
Standard includes the entire main window, including metering, Mid/Side and Mix Check. Pro adds the eleven Analysis Lab tools, A/B/C/D comparison in Live, whole song or selection mode, and the PDF comparison report. The audio quality of the comparison is the same.
How long does the test last?
The Pro trial lasts seven consecutive days, only once per device and product, without automatic switching to payment. Download the installer from the Download page.
How many devices can I activate?
The license includes two devices active at the same time. You can manage them from the My Licenses portal; for assistance write to licenses@trbaudio.com.
Do you need an Internet connection?
Used to start the test, activate and renew the validation. The signed business grant allows up to 30 days offline. The expiration of this validation is not the expiration of the perpetual license.
Is this a standalone audio player or a DAW plugin?
Mastering Player is a standalone Windows x64 application: you can use it without opening a DAW. It plays, compares and analyses audio files; it does not perform automatic mastering or modify your original files.
Can I play and compare WAV, FLAC, MP3 and AIFF files?
Yes. The player supports WAV, FLAC, MP3 and AIFF, with compatibility depending on the codec and container. Load up to four references, align them and compare the same passage. See the system requirements for audio-path details.
Try Pro for 7 days
Version notesUser manual
Complete user manual, available offline
User manual