F3, G3 and A2 represent three notes in music, which are F, G and A respectively. The pitches of these notes are arranged from low to high, namely A2, F3 and G3. It should be noted that the pitch in music is represented by letters, in which A, B, C, D, E, F and G represent different pitches.

mixing refers to mixing different sounds together to achieve a specific sound effect. In music production, mixing can be used to adjust the volume, timbre and sense of space, so as to make the final music work more beautiful and attractive. The process of mixing usually involves mixing different audio tracks together, including guitar, voice, drums and other musical instruments. Through mixing, we can create an overall sound effect and make the music richer and more vivid.