ReaTune
ReaTune has three main modes – tuning mode, automatic pitch correction, and manual pitch correction.
Kind: concept (effect-summary) Source: REAPER Effects Summary Guide v3.04
ReaTune has three main modes – tuning mode, automatic pitch correction, and manual pitch correction. The required mode is selected by clicking on of the three tabs located near the top of its interface. To tune an instrument such as an acoustic guitar, connect the guitar via a lead to your sound card and set up a track ready for recording in the usual way. Insert ReaTune into the track's input FX chain. Enable input monitoring and make sure the track is armed for recording. To use ReaTune in one of the other two modes, insert it into the FX chain of track or media item, then select the required mode.