Install gsequencer by entering the following commands in the terminal:
sudo apt update sudo apt install gsequencer
Description:
Advanced Gtk+ Sequencer audio processing engine
Advanced GTK+ Sequencer is intended to be used for music composition. It features a piano roll, as well as a synth, matrix editor, drum machine, soundfont2 player, mixer and an output panel. It’s designed to be highly configurable. You may add effects to its effect chain; and add or remove audio channels/pads. You may set up a fully functional network of engines, thus there is a link editor for linking audio lines.
Homepage: https://nongnu.org/gsequencer
Version: 1.4.24-1ubuntu2
Section: universe/sound