I'm very pleased that mandolintab converter is back.

I only use mandolintab very occasionally to produce a line of melody and lyrics on a PDF & a midi.
I only have an android tablet to work on.

But,,,
The top octave has started coming out an octave lower than written.
I mentioned this on an ABC users Facebook group and the consensus seems to be it's a bug.
Someone said it's been buggy for six months.

e.g.
X:1
T:Notes
M:C
L:1/4
K:C
C, D, E, F,|G, A, B, C|D E F G|A B c d|e f g a|b c' d' e'|f' g' a' b'|]
when submitted to
http://www.mandolintab.net/abcconverter.php
generates
X:1
T:Notes
M:C
L:1/4
K:C
C, D, E, F,|G, A, B, C|D E F G|A B c d|e f g a|b c\' d\' e\'|f\' g\' a\' b\'|]

the c\' plays on the midi as prints as c