Floop Master Control is a REAPER mastering and monitoring JSFX plugin designed for accurate loudness, True Peak, and stereo analysis directly on the master bus.
This REAPER mastering and monitoring JSFX combines LUFS metering, True Peak limiting, spectrum analysis, phase correlation, and monitor control tools into a single interface, allowing engineers to evaluate mixes and masters without loading multiple plugins.
The plugin optimizes real-time monitoring, embedded MCP use, and adaptive scaling across both laptop and high-resolution displays.
The following video provides a visual overview of Floop Master Control in action, showing the interface and monitoring workflow directly inside REAPER. If you encounter any issues or have feedback, feel free to leave a comment on the video.
If you encounter any issues or have feedback, feel free to leave a comment on the video.
Key Features of Floop Master Control – REAPER Mastering and Monitoring JSFX
Loudness & True Peak Monitoring
- ITU-R BS.1770-4 compliant LUFS metering
- Short-Term and Integrated LUFS measurement
- True Peak metering with inter-sample peak detection
Spectrum Analysis
- High-resolution 4096-point FFT spectrum analyzer
- Standard or custom slope
- Mid/Side analysis
- Peak hold with manual reset
- Frequency and dB readout on hover
- Freeze mode for static inspection
Stereo & Phase Analysis
- Phase Correlation Meter with two modes:
- Standard (full-band correlation)
- Multiband correlation mode, providing frequency-dependent phase analysis across the entire spectrum to pinpoint localized cancellations
- Goniometer (vectorscope) for stereo field visualization
Oscilloscope
- Real-time waveform display
- Independent Left / Right channel visibility
- Mouse-wheel time-scale zoom
Monitor Control Tools
- Mid / Side monitoring
- Dim output (-20 dB)
- Low-end focus (below 120 Hz)
- Mid / High focus (above 120 Hz)
Configuration Panel
- Click the “C” button to access:
- Monitor gain
- True Peak limit
- LUFS target
- Spectrum analyzer settings
All settings support fast, non-destructive monitoring.
Adaptive Embedded UI
Floop Master Control supports embedded use in REAPER’s Mixer Control Panel (MCP), keeping critical metering information visible without interrupting the workflow.
Why Use a REAPER Mastering and Monitoring JSFX on the Master Bus?
- Floop Master Control helps you to:
- Monitor loudness and True Peak without external plugins
- Analyze stereo balance and phase coherence in real time
- Reduce FX chain clutter on the master bus
- Keep all critical mastering meters visible in a single interface
- Perform reliable reference checks during mixing and mastering
Installation via ReaPack
The recommended way to install and keep Floop Master Control up to date is via ReaPack.
Requirements
REAPER v7.0 or later
Native JSFX support (included in REAPER)
How to Install
Open REAPER
Go to Extensions → ReaPack → Import Repositories…
Open Extensions → ReaPack → Browse Packages
Search for “Floop Master Control”
Install and Apply
Advanced users can manually install the plugin from the GitHub Release page.
Who Is Floop Master Control For?
Mixing engineers who want reliable master bus monitoring
Mastering engineers working entirely inside REAPER
Producers who need loudness, stereo, and phase checks without clutter
Users looking for a lightweight, integrated JSFX monitoring solution
REAPER Mastering and Monitoring JSFX FAQ (Floop Master Control)
Is Floop Master Control an audio processor?
No. Floop Master Control is a monitoring and analysis plugin. It does not alter audio.
Does it replace other metering plugins?
It can. The plugin combines loudness metering, spectrum analysis, stereo, and phase tools into a single JSFX, reducing the need for multiple separate plugins on the master bus.
What makes the phase correlation meter unique?
Floop Master Control includes two phase correlation modes:
- Standard mode for full-band phase coherence
- Multiband correlation mode, providing frequency-dependent phase analysis across the entire spectrum to pinpoint localized cancellations
Is it suitable for mastering?
Yes. The plugin targets master bus monitoring, loudness control, and final mix evaluation.
Can I embed it in the REAPER mixer?
Yes. Floop Master Control supports embedded use in the Mixer Control Panel (MCP), keeping meters visible without opening additional windows.
Does it work outside REAPER?
The plugin uses the JSFX format and also works in other DAWs via YSFX wrappers (VST3), but it targets REAPER as its primary platform.
Does this plugin replace dedicated mastering plugins?
No. The plugin works as a monitoring and analysis tool and does not replace compressors, EQs, or limiters.
Can I use it on individual tracks?
Yes, but the plugin primarily targets master bus monitoring.
Does it work on macOS and Linux?
It should. Floop Master Control uses the JSFX format, and REAPER natively supports JSFX on Windows, macOS, and Linux.
The plugin does not rely on platform-specific external dependencies. However, development and testing have focused primarily on Windows.
Is it suitable for mastering loudness targets (streaming/broadcast)?
Yes. LUFS and True Peak metering follow industry standards and are suitable for streaming and broadcast workflows.
The project is hosted on GitHub, where the source code and manual installation files are maintained.
