Instruments will save and load with incorrect volume levels if you make a drumset, or you load a custom level.
More specifically, if I save a drumset with a volume level of 100%, it will actually save as 0.49 in the json. even odder is it will load as 70% volume level. note that this is on a per drum value. im saying drumset because all the instruments will have a volume level of 100%.
This has been a very long standing bug, so versioning will have to be kept in mind as people have worked around this bug to get the volume levels they
actually
want.