1. Playback Speed: Speed up the playing song with the H shortcut, slow it down with the Y shortcut, and return to the original playback speed with the HY (simultaneously) shortcut.
2. Restart: If you press the ‘R’ key while a song is playing, it will restart from the beginning without stopping. If the song is paused, pressing ‘R’ will rewind it to the beginning, and it will start playing from the beginning when you press the ‘Space’ key.