That you're recording a female's voice. Ghi âm means to record a voice or sound. The word âm comes from Chinese 音 meaning sound or noise. Ghi is likely an earlier "non-standard" borrowing of 記 (to record).
I answered "Chi ghi am co ay," which is a more correct way to call myself. Local people where I live in Hoi An would not call themselves "toi" in this example, they would call themselves "ahn," "em," "chi," according to their relative age.