Audio editing is the process of taking recorded sound and changing it directly on the recording medium (analog) or in RAM (digital). wikipedia.org

Audio restoration is a generalized term for the process of removing imperfections (such as hiss, crackle, noise, and buzz) from sound recordings. wikipedia.org

Adobe Audition (formerly Cool Edit Pro) is a digital audio workstation from Adobe Systems featuring both a multitrack, non-destructive mix/edit environment and a destructive-approach waveform editing view. wikipedia.org

Ableton Live is a loop-based software music sequencer and DAW for Mac OS and Windows by Ableton. wikipedia.org

Mastering, a form of audio post-production, is the process of preparing and transferring recorded audio from a source containing the final mix to a data storage device (the master); the source from which all copies will be produced (via methods such as pressing, duplication or replication). wikipedia.org

An audio engineer is a specialist in a skilled trade that deals with the use of machinery and equipment for the recording, mixing and reproduction of sounds. wikipedia.org

A record producer is an individual working within the music industry, whose job is to oversee and manage the recording (i.e. "production") of an artist's music.