"Keith G" wrote in message

OK, pending my marching orders from Arny (or anybody
else, come to that) I've got another 'dual mono' question
to ask:
This don't look right to me:

http://www.moirac.adsl24.co.uk/showntell/HeejusDin.jpg


Is it dual mono?

Could be.

Is it possible to tell by just looking at the waveform?

The tolerance on visual examination of waveforms is on the order of 1%,
depending on how you line up and magnify things.