You can install 'milkytracker' , a clone of "fasttracker 2"
It plays/edits .MOD and .XM files
You can install "winff" for videoconversion or "handbrake".
Also, the mediaplayer "VLC" has some conversion options.
For audioconversion you can install "soundconverter"
I usually use a terminal application called "ffmpeg" which can convert anything to anything including use of hardware acceleration.
However, the learning curve is a bit steep, so you might be a bit overwhelmed at first.
To install the aforementioned applications, open a terminal and type:
sudo apt-get install milkytracker
sudo apt-get install handbrake
sudo apt-get install winff
sudo apt-get install soundconverter
There is also a graphical software installer available called "synaptic" with the capability of installing over 80.000 readily made applications
sudo apt-get install synaptic
Now here follows a disclaimer:
I only have PC's so I don't know if all of the above mentioned applications are available for the raspberry pi.
But it is at least worth a try
P.S. I haven't run MS-Windows for over a decade (except for games).
Everything I do is with Ubuntu-MATE and Ubuntu-studio including: video editing, photo-editing, multitrack/multichannel audio recording/editing, etc. etc. etc. so I know a thing or two about replacing MS-Windows applications with Linux applications. If you need some tips, just ask