The AudioSpectrumMonitor app is a free Android app for tuning and recording. The app is a really complex spectrum monitor that you can use for things other than music. You could be able to use it in physics, as well as for other sciences, but the app surely works for music. You can use it as a chromatic tuner for all instruments and your voice, as the app has a top menu for tuning. The app can show you the entire representation of the sound that is received as well as the musical pitch of it. The app can: set threshold of volume, set graphic to screen ratio, use liniar or logarhythmical vertical scale, set frequency resolution, set octave number, calibrate, set peak hold time and set tuner smoothing. You can also set everything to default, load what you have recorded or anything alse (.wav files) as well as use the built-in player to play the songs. The AudioSpectrumMonitor app is a really useful Android app for tuning and for viewing your song so as to make sure it does not have equalization issues.