Here is the thing. Midi is a two way street.. If some one uses LMMS as their sequencer, and makes volume changes in LMMS then sends that sequence data back out over midi, the music volume will clip. This would be highly undesirable. Instead it would be better to have the option to normalize the midi volumes so the external instrument can reproduce the actual track. The physical volume of the external device can then be adjusted to compensate. From a recording standpoint if your track is mixed with a 1-20% volume scale, and then try and record a new midi tack, if it comes in at 100% it could be adjusted after, but it would be nice if you could play relative to the existing data, because it could impact how a person plays. Thus having a toggle for normalizing/over-driving the midi volume in my opinion is the best option that way the user can choose how they want to deal with the issue.