"I purchased one unit of TC Helicon Harmony Singer 2 and it became faulty after a while. I read that the problem was not uncommon and a replacement would be made if purchased within 3 years. Contacted TC Helicon and was asked to send the unit back to National City, California, USA. In the last communication on June 9 2019, I was told a replacement unit would be sent to me. However until today, I have not received any reply nor new unit and my enquiry was not answered."