I'm sorry, I don't know very much about sound production so you'd better read a report from one of the other reviewers. I bought this machine because I am an amateur theatre director. At the beginning of rehearsals, I sit the cast in a large semi-circle and set up my H4n on a camera stand in the centre. We read the parts from the script and I produce a copy on CD for them to learn. Oh, and I have managed to record my own voice and a kareoke track and mix the two together using 'Audacity'. I did sit listening to my partner talking to her collegue the other day and as they chatted I decided to record them as I had nothing better to do. After I'd finished i plugged in some cheap earphones to listen to the recording - wow! When I took the phones out the sound of their voices was exactly the same as the recording. This was strange and very weird and my brain became really confused as to which was the live sound and which was the recording.
What I can comment on is the quality of construction. I'm sixty - and this piece of equipment takes me back to the good old fifties and sixties, when most electrical field equipment was built for the army. Too many of todays gagets are flimsy by comparison and most have a built in design fault, like a battery compartment door which breaks off when you look at it. These days manufacturers seem to talk about light weight as though it's agood thing. Give me rugged and robust anytime.
Regarding faults in construction design - I can't find one. I just have a confidence that this machine will serve me for quite a few years and if it does have the ability to carry out much more useful recording techniques, well I'll be glad to pass it on to my son, who knows about these things.