Request: new function HEX2DEC and DEC2HEX

I would like to use them to edit m4a duration info (iTunSMPB/delay,content samples,padding) at my own risk.

I bet, you could add some sort of hex editor under tools menu.

I found this link to a command line script to calculate hex values.

you probably can divert the output to a text file and then import the data into MP3tag.
Yet, I do not see a field called "iTunSMPB"