P_PARAM
int32 idx = id - P_PARAM;
int32 idx = id - P_PARAM;
int32 idx = id - P_PARAM;
P_PARAM + param->Index(), B_MEDIA_NO_TYPE,
fSelectorsGroup->MakeDiscreteParameter(P_PARAM + param->Index(),
value = group->MakeContinuousParameter(P_PARAM + param->Index(),