if you are describing oral Chinese,I think maybe 音调and声调 have the same meaning.语调 is a property of a sentence,it is composed by each 声调，it's like manner of speaking in English

音调is used to say about a word or letter, every word or letter has its own 音调, such as "a", "bai",... 声调 mention about a word only, and u know, there are only 4 kind of 声调 in chinese, like in 妈，麻，马，骂. and we use 语调 when we mean the tone of a whole sentence or a clause, like " u use rising 语调 in a question ending with 吗".