"I speak to you but you do not hear me."
Translation:Io ti parlo ma tu non mi senti.
I guess you know this by now, but for others who are wondering, mi is both the direct object pronoun and indirect object pronoun. me is the stressed pronoun. However the indirect object pronoun mi changes to me when it is before a direct object pronoun.
"Io ti parlo ma mi non senti" was not accepted. Why is the tu necessary? Isn't it implied by the senti.