MIDI Instrument creation script

Hello list !

I am a newcomer here, new to Rosegarden and Linux computer music in general.
For those old enough to know, I am coming from Cubase Score on Atari 
FALCON CLAB MKX.
I am learning Rosegarden and setting up my studio environment and wanted 
to prepare a MIDI Instrument definition to manage my Roland JV-1080 banks.
But I found the SR-JV80-07 - Super Sound Set Expansion Board Device file 
is missing.

Then  I tried to make it on my own, following Wiki information:

https://www.rosegardenmusic.com/wiki/dev:device_files#editing_with_the_gui

https://www.rosegardenmusic.com/resources/documents/rgd-HOWTO.shtml

I check the JV-1080 MIDI chart from Owner's Manual and here:

https://static.roland.com/assets/media/pdf/Jv1080sq.pdf

and found I should use (Board in expansion D) these settings.

MSB    LSB    PrgChg    Patchs
84        6        0-127    1-128
84        7        0-127    129-256

Problem, when trying to generate the RGD file I have got following error 
message :

/Traceback (most recent call last):
   File "/home/userfolder/rosegarden/./txt2rgd.py", line 299, in <module>
     name = f"{MSB:03u}-{LSB:03u}"
ValueError: Unknown format code 'u' for object of type 'int'/

I made a few tests editing the csv source file I found out the converter 
accepts only :

  * 0 as MSB, at least from 0 to 10.
  * doesn't accept 7 value as LSB.

Am I doing something wrong ? IS it a bug ? Any explanation or 
investigation suggestion to solve this ?

Thanks, and best regards.

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