M_SKIP_PREV
PostMessage(inv ? M_VOLUME_DOWN : M_SKIP_PREV);
PostMessage(inv ? M_SKIP_PREV : M_VOLUME_DOWN);
case M_SKIP_PREV:
PostMessage(M_SKIP_PREV);
PostMessage(M_SKIP_PREV);
PostMessage(M_SKIP_PREV);
PostMessage(M_SKIP_PREV);
PostMessage(M_SKIP_PREV);
PostMessage(M_SKIP_PREV);