I guess it depends on if you think a computation is a manipulation of symbols. The sort of physical processes involved in a piano making sound are not symbolic

I guess it depends on if you think a computation is a manipulation of symbols. The sort of physical processes involved in a piano making sound are not symbolic manipulations, and being modelable through symbolic manipulations, or giving the same results (at whatever level of abstraction) as a symbolic manipulation, is not the same as being a symbolic manipulation.