Install jconvolver by entering the following commands in the terminal:
sudo apt update sudo apt install jconvolver
Description:
Convolution reverb Engine for JACK
Jconvolver is a Convolution Engine for JACK using FFT-based partitioned convolution with multiple partition sizes. It can execute up to a 64 by 64 convolution matrix (i.e. 4096 simultaneous convolutions) as long as your CPU(s) can handle the load.
Homepage: http://kokkinizita.linuxaudio.org/linuxaudio/
Version: 0.9.3-2
Section: universe/sound