

Multiple components of a track can be processed simultaneously (for example, to isolate piano and vocal, or enhance piano and bass). Naturally the author points out that the exact results are subject to the particular characteristics of each track. This claims to be capable of isolating, removing, suppressing or enhancing any component of a stereo track, based on its identified frequency and spatial "signature" (components are selected inside a "2D Mode" spectrogram window). There is a commercial VST plug-in called Extra Boy Pro which offers useful functionality for those interested in vocal removal, isolation or modification of the different components of an audio track.Brainworx have a free (registration-required) VST plug-in bx_solo that lets you solo mid and side channels so provides opportunity for vocal isolation or removal in the right circumstances.There is a demo version with a "mild" vocal removal setting (but no isolation ability) that works in Audacity. It has an advantage over kn0ck0ut of providing stereo output for the "vocals removed" track, as well as offering isolation of center-panned content. Voicetrap is a commercial plug-in featuring center channel removal by frequency-based and cepstral methods (that is, not a simple subtraction of one channel from the other).For installation of VST plug-ins, see below. There are several Windows VST plug-ins that can be used in Audacity for vocal removal and isolation. Audacity has a built-in effect for vocal removal Vocal Reduction and Isolation, accessed by: Effect > Vocal Reduction and Isolation.
