Hall Reverb Prototype

Hall Reverb is a mono/stereo to stereo algorithmic reverb audio plugin. It uses the implementation of Moorer's early reflection model and a simple FDN reverb based on zita-rev1 from the Freeverb3 signal processing library.

Disclaimer

• ⚠️ This plugin is only a prototype! ⚠️
• It may be unstable or generate noise at certain parameter values.
• The current parameter ranges have been chosen more or less randomly and may not make sense sometimes, but can of course be changed.

Plugin Parameters

Parameter	Freeverb Name	Description
dryLevel	DRY	The level of the dry signal.
earlyLevel	EWET	The level of the early reflection signal.
earlySendLevel	ESEN	The level of the early reflection signal which was send to the late reverberation.
lateLevel	LWET	The level of the late reverberation signal.
earlyOutputHPF	EHPF	The cutoff frequency of the high pass filter of the early reflection signal.
earlyOutputLPF	ELPF	The cutoff frequency of the low pass filter of the early reflection signal.
earlyRoomSize	EFAC	The room size of the early reflection.
earlyStereoWidth	EWID	The stereo width of the early reflection.
lateApFeedback	ADIF	The strength of the allpass diffusor in the FDN loop.
lateCrossOverFreqHigh	XOH	The high crossover frequency for the late reverb time.
lateCrossOverFreqLow	XOL	The low crossover frequency for the late reverb time.
lateDecay	RT60	The reverb time.
lateDecayFactorHigh	RTHi	The high frequency gain for the late reverb time.
lateDecayFactorLow	RTLo	The low frequency gain for the late reverb time.
lateDiffusion	IDIF	The strength of the input allpass diffusor.
lateLFO1Freq	LFO1	The first frequency of the LFO in the FDN loop.
lateLFO2Freq	LFO2	The second frequency of the LFO in the FDN loop.
lateLFOFactor	LFOF	The strength of the LFO in the FDN loop.
lateOutputHPF	LHPF	The cutoff frequency of the high pass filter of the late reverb signal.
lateOutputLPF	LLPF	The cutoff frequency of the low pass filter of the late reverb signal.
latePredelay	IDEL	The length of the initial delay of the late reverb wet signal in ms.
lateRoomSize	SIZE	The late reverb's room size.
lateSpin	SPN	The frequency of the output chorus.
lateSpinFactor	SPNF	The strength of the output chorus.
lateStereoWidth	LWID	The stereo width of the late reverberation.
lateWander	WAN	The length of the output chorus.

Next steps

• Decide which parameters should be visible in the final GUI.
• Decide what to do with parameters that are not visible in the final GUI (set to a fixed value or set depending on other parameters?).
• Decide on the final parameter ranges.
• Decide on parameter range transformations (0-1 -> 0-100% etc.)
• Create presets for different halls.
• Implement final GUI.

Download

The latest prototype is available here.

Building Hall Reverb

Hall Reverb uses the JUCE C++ framework. If you are on Linux, you need to install these dependencies first.

# Get the repository including submodules
git clone --recurse-submodules https://github.com/cvde/HallReverb.git
cd HallReverb

# Build plugin with CMake
cmake -DCMAKE_BUILD_TYPE=Release -B build
cmake --build build

After a successful build, the plugin binaries can be found in build/HallReverb_artefacts.

References

• Freeverb3 signal processing library
• Freeverb3VST
• Freeverb3 Hibiki Reverb Parameter reference

Licenses

Hall Reverb is free software and distributed under the GNU General Public License Version 3.

Freeverb3 is free software and distributed under the GNU General Public License Version 2.

JUCE is dual licenced under both the JUCE licence and the GNU General Public License Version 3.

All other trademarks, registered trademarks and logos or other manufacturers written or shown herein are the property of their respective owners. Use of them does not imply any affiliation with or endorsement by them.