From the PG Music 2021 documentation:
Utility Tracks
There are 16 new editable Utility tracks, which can be used for audio and/or MIDI. You can generate RealTracks on the Utility tracks, where you can hear and edit the audio RealTracks, or view and edit the RealCharts MIDI. You can record audio or import an audio file to the Utility tracks to play, edit, or harmonize the audio. You can copy or move audio, MIDI, or both from other tracks to the Utility tracks. You can record MIDI or import a MIDI file to the Utility tracks for playback, notation display, or editing.

There's a video here:

BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones