Sent this in error, just to Chris so re-sending to the list.
Have just tried it unplugged and while it isn't perfect, it is better.
Bev
On 04/07/2020 17:36, Bev Nicolson wrote:
<snip>
Also, is there anything else plugged in to the laptop, USB devices or whatever, if so try disconnecting them as well.
By the way - by 'hum' you do mean mains hum do you? I.e. a very low
frequency hum of fixed frequency.
Hopefully this short audio clip will explain the hum. I don't hear it as I record anything, but only on play back.
I have headphones and a mouse plugged in, to answer your other query, but if anything it's worse without the headphones.
Bev