Amazing Song Trainer is described as 'Learning Tool for instrument solo's or singing' and is an app in the Audio & Music category. There are more than 25 alternatives to Amazing Song Trainer for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Audacity, which is both free and Open Source. Other great apps like Amazing Song Trainer are AudioMass (Free, Open Source), Sonic Visualiser (Free, Open Source), Transcribe! (Paid) and Amazing Slow Downer (Freemium).
Without touching any control, MusicTrans will give you a graphical view of what notes are being played. An intermediate player can easily get the basic chords just by looking at the screen, and that’s just the tip of the iceberg!
DarkAudacity is a build/fork of the the well known free sound editor, Audacity, customized with a darker, more modern theme - and a few small tweaks. The audio engine underneath is the same audio engine. The same code powers it. Like Audacity, it is completely free.