The ornamental design for a semi-circular pedalboard, as shown and described.
FIG. 1 is a top front perspective view of the semi-circular pedalboard;
FIG. 2 is a right elevation view of thereof;
FIG. 3 is a left elevation view of thereof;
FIG. 4 is a top elevation view of thereof;
FIG. 5 is a bottom elevation view of thereof;
FIG. 6 is a front elevation view of thereof;
FIG. 7 is a rear elevation view of thereof; and,
FIG. 8 is a detail cross sectional view of taken along line 8-8 of FIG. 4.
The broken lines shown in the drawings illustrate portions of the semi-circular pedalboard that form no part of the claimed design.
The broken away symbols in the drawings indicate the appearance of any portion of the article between the break lines forms no part of the claimed design.