The ornamental design for a mainbody for audioplayer, as shown and described.
FIG. 1 is a front, right side, perspective view of a main body for audio player showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a reference view showing speakers are installed on the claimed design.
The broken lines indicate portions of the article that form no part of the claimed design. The broken line showing of speakers is provided for the purpose of illustrating environmental structure and form no part of the claimed design.