Back in the old days you could remove the vocal from a stereo track by subtracting the left channel from the right.

* You only got mono output,

* The bass was missing,

* The mix sounded terrible,

* You could only remove the vocal, not isolate it,

* It only really worked on old tracks, before they started using stereo
reverb.

Voice trap offers two sophisticated DSP algorithms:

* FFT-based center channel suppression / isolation,

* Cepstral liftering (an advanced technique that can identify harmonically rich elements in a mix).

Together these allow Voice Trap to overcome those problems:

* The output is stereo,

* The bass frequencies are left untouched,

* The mix is largely preserved,

* You can choose to remove the vocal OR isolate it,

* Good results possible on some modern tracks (ie, with stereo reverb).