Thanks John, I didn't pick it up either but there again most tunes I looked at were from JC's and there are loads of tunes to pick on that don't touch the 4th string (below the range of Irish pipes, flutes, etc).

There is also a problem with the high range. It cuts off at the 5th of 7th fret.

I've spent the last 4 hrs trying to get my head round perl (has some very wierd symbols I don't understand) as well as trying to understand at least part of the program and downloading perl2exe to compile the source code.

I know what the problem is: The number of frets before changing up a string are stored in an array($StringDelt) and indexes get a little confused...

I think I've got as far as fixing it for mandolin (well I have a version that will display a scale from the bottom G up to E on the first string 12th fret)...

Jon