Install snd-gtk-jack by entering the following commands in the terminal:
sudo apt update sudo apt install snd-gtk-jack
Description:
Sound file editor (GTK+ user interface - JACK)
Snd is a powerful sound file editor that can be customized and extended using the Scheme programming language. . This package contains the files for the GTK+ user interface with JACK and ALSA support.
Homepage: https://ccrma.stanford.edu/software/snd/
Version: 18.1-1
Section: universe/sound