The ornamental design for a soundcontrolpanel, as shown and described.
FIG. 1 is a front view of a sound control panel showing our new design; and,
FIG. 2 is an enlarged sectional view, taken at line 2-2 in FIG. 1.
The broken line showing of the sound control panel is included for the purpose of illustrating portions of the sound control panel and forms no part of the claimed design.
The dot and dashed lines mean a boundary between the claimed portion and the non-claimed portion.