Well the answer lies in the word really. "Mono" literally means "one", so variation will make you less monotone.
I'm not really sure what your question is about though. Do you mean in terms of songwriting or the timbre (tone quality) of your voice? Or something else entirely?
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I'm not really sure what your question is about though. Do you mean in terms of songwriting or the timbre (tone quality) of your voice? Or something else entirely?