Flufs

Flufs is a state-of-the-art Max for Live loudness meter, designed for both real-time and offline analysis. It’s fully accessible to blind, visually impaired, and sighted users.

Flufs can analyze multi-channel audio files, normalize to a loudness target, and, if you're into data science like me, export loudness data to a CSV file—either in single or batch mode. It analyzes a 5-minute audio file in just 1–2 seconds.

Flufs is very light on the CPU — to the extent that you won’t even notice it on modern computers. It features a resizable floating window, 11 color themes (including options for color blindness), and 19 industry loudness target presets. It also integrates seamlessly with popular screen readers like VoiceOver and NVDA, making it compatible with braille displays and other assistive technology. Every feature is accessible via keyboard shortcuts or tabbing.

Flufs is available as either a free or paid download. Both versions are identical - it's simply a way to ensure that everyone can access it, regardless of their ability to support my work.

System Requirements:

Live 11 or higher + max for live
mac os 11 (Big Sur) or higher
windows 11 or higher

Keyboard shortcuts

Shift Control V – Toggle narration and keyboard shortcuts

Escape – Cancel or stop speaking

Shift Control 6 – Keyboard shortcut overview

d – Operation mode

Shift + 1 – Momentary L U F S

Shift + 2 – Short-term L U F S

Shift + 3 – Integrated L U F S

Shift + 4 – True Peak

Shift + 5 – Loudness Range

e – Real-Time L U F S meter reset

shift+e – Real-Time True Peak meter reset

t – Current loudness target

> – Browse next target

< – Browse previous target

Shift + 9– Rotate between editing custom target values of Integrated, Tolerance, and True Peak

Comma (,) – Decrease value

Dot (.) – Increase value

f – Open file in off-line mode

i - loaded file details

g – Save file in off-line mode

w – Export C S V in off-line mode

N – Normalize to loudness target in off-line mode

Shift + f – Select batch source folder in off-line mode

Shift + g – Select batch target folder in off-line mode

Shift + w – Start C S V batch conversion in off-line mode

p – Play or stop the currently loaded sample in off-line mode

Shift + p – Reset the playhead of the currently playing sample in off-line mode

Shift Control + l – Nudge the playhead forward

Shift Control + r – Nudge the playhead backward