I am planning to get back on HF after being inactive for decades. I'm planning on buying a new HF radio in the future. I used to like to use CW full break-in and AMTOR. I understand AMTOR is not popular anymore. My Kenwood TS-940 relays were pretty quiet, but some radios, the relays are very loud, and listening to a lot of loud clanging relays would be very annoying. How quiet are the switching relays with the Flex radios?