Robin Gareus
AT1 is an 'autotuner', normally used to correct the pitch of a voice singing (slightly) out of tune. The 'expected' pitch can be controlled by MIDI, or be a fixed set of notes. AT1 can probably be used on some instruments as well, but is primarily designed to cover the vocal range.
This is a companion discussion topic for the original entry at https://pedalboards.moddevices.com/plugins/aHR0cDovL2dhcmV1cy5vcmcvb3NzL2x2Mi9mYXQx