Mike, thanks for the advice and my apologies for not replying for so long but been tied up solving some of my other issues. I tried many different values of series capacitors but this did not work. I have been taking the output directly from the nano voice output pin 3, I have also tried adding an LM386 amplifier but nothing has removed the click other than a capacitor in parallel with the output which softens it. It seems to me to be something like a stop click from the software but I do not know how to prevent it. Any others ideas??. Thanks Mark