Install fmit by entering the following commands in the terminal:
sudo apt update sudo apt install fmit
Description:
Free Music Instrument Tuner
FMIT is a graphical utility for tuning your musical instruments, with error and volume history and advanced features like microtonal tuning, statistics, and various views like waveform shape, harmonics ratios and real-time Discrete Fourier Transform (DFT). All views and advanced features are optional so that the interface can also be very simple.
Homepage: http://gillesdegottex.github.io/fmit
Version: 1.0.0-1build1
Section: universe/sound