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Problem solved! I got the book pf words out and read through some of it and I found that there are 4 recordmodes on this unit (Panasonic) XP high quality short duration SP which I tend to use LP and FR (flexible recording) it seems that you enter thr duration of the programme and the unit adapts recording mode to fit that time onto available space.
The programme is being repeated this afternoon so will find out. - It does pay o read the book of words!