Hi FastBitz, are you using Windows or Mac, be helpful for recommendations.
I use a couple of pieces of software, neither are free but they suit my needs.
dbpoweramp has a free trial period and has numerous encoding options including a normalize and supports most file types.
Platinum Notes is the other piece that i use which also supports the file types you stated, supports Mac and Windows however they do not have a free trial although you can buy and try and refund if you don’t like it.
dbpoweramp is certainly the fastest of the two but i think is Windows only.