I claim, the ornamental design of a sound module, as shown and described.
FIG. 1 is a front view of a sound module according to the claimed design;
FIG. 2 is a rear view of a sound module according to the claimed design;
FIG. 3 is a left side view of a sound module according to the claimed design;
FIG. 4 is a right side view of a sound module according to the claimed design;
FIG. 5 is a top view of a sound module according to the claimed design;
FIG. 6 is a bottom view of a sound module according to the claimed design;
FIG. 7 is a perspective view of a sound module according to the claimed design; and,
FIG. 8 is a perspective view of a sound module according to the claimed design in an example environment of use.
The ornamental design which is claimed is shown in solid lines in the drawings. The portions of the sound module shown in broken lines form no part of the claimed design.