2.5 Reverb

The reverb algorithm is based on a 4-channel convolution. A set of impulse responses is given with the software, but other IR files can be added in the preset/IR folder of the application.

To recreate the distance effect, the UI allows to place 4 virtual microphones away on which the sound sources are spatialized with the same processing than for the speaker groups. The signal feeding the 4 virtual microphones is then sent to the reverb engine and spatialized on the speaker groups at the place of the 4 virtual microphones. Sources placed way, then close to the virtual microphones are processed with a higher dry/wet ratio of reverberation. The distance from the source to the microphone also sets the pre-delay.

This method does not recreate any physical model but allows to get a realistic rendering and is quite easy to implement. This method is explained on the blog wfs-diy.net blog.

Recommended placement of virtual microphones (red) for a 360° setup (speakers in green or blue)

Recommended placement of virtual microphones (red) for a frontal setup (speakers in green or blue)

Reverb
Init	Replace the virtual microphones to their initial positions
Color	Change the color of the reverb, the color will be applied to the virtual microphones and the gains faders of the reverb busses of each source
IR selection	Selects an impulse response of the folder /presets/IR. You can also drag and drop a folder on the menu to access the IR files of the folder