I claim the ornamental design for a soft toss pitching machine, as shown and described.
FIG. 1 is a top, front, left side perspective view of a soft toss pitching machine showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in the figures are for the purpose of illustrating portions of the soft toss pitching machine that form no part of the claimed design.