@jamcultur I have never seen documentation for this. I just noticed years ago that if the standard help files were not in a known path then they would not be found.... and that they were all named something-help.pd
A quick google search finds an old post......... https://forum.pdpatchrepo.info/topic/6874/creating-a-help-file
The forum search tool is not useful.
When searching the forum it is best to use a search engine....... "pdpatchrepo what I am looking for.."
David.

@jamcultur If your module is called e.g. module.... [module] ... module.pd.... then create the help file and name it .... module-help.pd
It needs to be found when you right-click [module] and select "help"...... so put it in the same folder as [module] or a folder set in the path preferences of Pd, or use [declare] in [module] so that it can be found.
David.

@FFW You might have more luck using the coords message rather than donecanvasdialog.... as coords doesn't need the useful hacks that are mentioned above.
I have added a size message to an old gop demo patch and it seems to work reliably with a sub-patch.
I haven't checked for an abstraction
gop_switch_coords.pd
David.

@KMETE RPI2 is 64-bit so you should be able to install the latest Pd...... but if there is no package for your OS then you will have to compile it...... which I understand is easy in Linux.
First on the list here for compilation...... https://puredata.info/downloads/pure-data ..... if there is not a good package further down the list.
David.

@KMETE You need 0.52 for [file] and as it is built into Pd it cannot be added to 0.51 unless you can find some external to do the job.
In the zip I posted above cart5.pd was built with extended, and there are externals from the hcs and ext13 libraries that you might find available for Linux Pd 64bit.
hcs/folder_list and ext13/strippath
Or maybe it's a good time for an upgrade?
David.

@KMETE For vanilla Pd you need to open cart5-vanilla.pd.
You can use [change] after [random] to avoid repeats, but need a mechanism to ask [random] for a new value when a repeat is rejected.
No time to look at your patch until this evening but someone will probably reply....
David.

@KMETE This...... random_shuffle_cart.zip ... should work. The vanilla [cart5-vanilla] needs at least Pd 0.52 I think for [file].
You can simplify it maybe, especially if you give your wav files names 0.wav, 1.wav etc., but it will give you some ideas.
David.

@atux Sorry, it's probably a [ctrlout] message needed, but I cannot be sure.......
This video probably helps .....

As it is xml and javascript based then if the Mixxx wizard doesn't help then it will be harder.
You might need to be sending relative position info...... there is some help in this forum for that but searching on the net "pdpatchrepo whatIAmLookingFor" is the easy way to find stuff on this forum.
David.

@atux You probably need to map a slider in Pd to the scratch control in Mixxx.
Mixxx will auto map if you install some DJ surface, but it seems that it can "learn" from received midi....
https://manual.mixxx.org/2.5/en/chapters/advanced_topics#advanced-controller

So if you have a slider sending to [midiout] on a channel then probably "vinyl control" could learn the parameter.
David.

@willblackhurst Yes, it works for all objects in abstractions (not messages).
But the OP doesn't want to use them, and has had some very strange things happening in their patch
As @oid says, without the patch we cannot see what is going on.
David.