1. Install MMA Musical Midi Accompaniment from Ubuntu repository:
sudo apt-get install mma
For other distributions install from your usual repository or package provided at https://www.mellowood.ca/mma/packages.html.
2. Download BandInMuseScore plugin, and uncompress it anywhere you like, preferably in your Documents/MuseScore3/Plugins directory.
3. Optionnaly edit the properties at the beginning of file BandInMuseScore3.qmlto match your preferences: default groove name, tempo, and various files locations.
0. If you don't already have Python installed you could download a single zip with Python3.7.2 and MMA19.08 for windows 64bits platforms, unzip it in C:\WPython64 (make sure it's not a subfolder) and skip to step 5. Since it's portable you can simply delete the whole directory to uninstall. Or do the whole install yourself (takes less than 10 minutes) with the following instructions:
1. Install a ligthweight portable Python such as WinPython.
The 'Zero' version (without most external librairies and IDE) is about 40Mb download, 110Mb installed. The full version contains many goodies you may find interesting but not need. This plugin has been successully used in Windows8 with WinPython64-3.7.4.0Zero.
Install WinPython, recommended in C:\WPython64. Since it's portable you can freely move/rename/delete the whole directory as needed.
2. Download and uncompress the MMA Musical Midi Accompaniment package from its download page. This plugin has been tested with MMA v19.08, other versions should work just fine. Uncompress (un-gzip AND un-tar) it anywhere you like, recommended in C:\WPython64\mma-bin-19.08.
3. Create a new file named mma.bat in this last directory, with the following content, where the first command makes the script change its working directory to the MMA directory, and the second line runs the mma.py file with WinPython. You need to update the Python version to the flavour you downloaded.
cd %~dp0
..\python-3.7.4.amd64\python.exe mma.py %1 %2 %3 %5 %6
4. Initialize the database of all available grooves and sequences by running the following command in the MMA directory (via file explorer > go to MMA diretory (C:\WPython64\mma-bin-19.08) > File > Open Command Prompt :
mma -G
5. Download BandInMuseScore plugin, and uncompress it anywhere you like, preferably in your MuseScore3/Plugins directory.
6. Optionnaly edit the properties at the beginning of file BandInMuseScore3.qmlto match your preferences: default groove name, tempo, and various files locations.
Likely very similar to the Linux install, at the beginning of this document. Please provide feedback & guidance if you have any experience.