Synk: Aexis Line contains four tracks. The first track, "Blue", performed by
Winter, is described as a
pop-rock song distinguished by its gradually intensifying guitar sound. The lyrics express a determined resolve to keep moving forward despite feelings of helplessness, and complement her signature delicate vocal tone. The second track, "Ketchup and Lemonade", which is performed by
Ningning, is described as an
R&B track that pairs a subdued, languid sound with Ningning's emotive vocals. The lyrics portray the delicate inner conflict of wanting to forget a breakup yet being unable to let go. The third track, "Tornado", performed by
Giselle, is described as a
tropical dance track that delivers a refreshing yet dreamy atmosphere. Its lyrics candidly express the emotional duality of wanting to stir both her own heart and the other person's "like a tornado." The last track, "Good Stuff", performed by
Karina, is described as a
hip-hop dance track characterized by its heavy sound and addictive hook. The lyrics project a confident and bold attitude, delivering an intense and empowering energy. ==Track listing==