Hello! Music tracks in .prt format are made using the Pretracker program. It appears to be a format commonly used in some Amiga demos. Unfortunately your program doesn't seem to support this type of format yet, so please add it so that I and others can enjoy the tunes individually without having to run a demo. I particularly need this feature in my mobile module player, so this may be possible by updating the main one. Here is a modland shortcut for a list of modules of this format: https://www.exotica.org.uk/mediawiki/index.php?title=Special%3AModland&md=qsearch&qs=Pretracker | Thanks in advance!
PreTracker's pre-calculated instruments are rather complex, and the calculations required to generate them are not publicly known. Without PreTracker becoming open-source, I don't see any chance in supporting this format.
