howard winwood G4GPF
are you using a mobile phone?
is the mike of the phone near to the speaker?
you should see audio signals from the speaker as a green image.
then follow instructions.
if you have already set up the BFO, you can check how close you are to optimum.
I originally set mine up with a strong ssb contact to get best sounding audio.
checking with this utility showed mine to be set in the middle of the two vertical red lines.