Audacity is a great software for recording and editing audio.
This music editor is capable of creating and editing multi-track recordings, which can come in a variety of different formats, such as MPEG, MP2, MP3, WAV, AIFF, AU, FLAC, AC3, M4A/M4R, Ogg Vorbis and others. You can use Audacity online to edit music records (Cut, Copy, Paste, Delete, apply a variety of effects), and do a lot of other things.
If you are looking for an audio editor online try Audacity on rollApp for free without downloading. Open your tracks from Dropbox, Google Drive, and other cloud storage, and work with them anywhere and any device. This is one of the best options to get an audio editing tool for Chromebook.