@chaley
Yes i meant TPM (now i am more familiar with Calibre vocabulary)
I don't know for others, but for me GPM is much more instinctive (even if i never code).
It appears like a revelation to me, things that i believed impossible seem to be possible now
Now, i want to "play" with my data and make it act exactly how i want.
You have to know that if now i am more demanding with my datas and myself, and if i post more for help, that is entirely your fault
(joke)