Howdy,
You can graph any of the MIDI parameters (eg. volume, pan, etc.) using the Graph Over Notes tab, and either drawing the graph you want, selecting a staff graph and using "Shift + down/up arrow" to shift a graph to a lower or higher level (very useful if there are changes you want to preserve, but want an overall higher or lower level), or use the "96" button to set a fixed level for the entire staff.
That said, you may also need to look at other controllers than just the volume. There's also note velocity, which can change the loudness of notes, as well as other controllers (eg. "Expression") which can affect the sound.
For instance, in this particular file, the volume level for all the staves is set at 96, so that doesn't appear to explain the volume increase you're hearing. However, using Graph Over Notes, you can see which controllers are used in the file. Just click on the "Ctl" button that has the red question mark (
?) on it. Any controller that is used in the file will have an asterisk (*) beside it. You can then click that controller to see the graph of that controller in the file. Controller 11-Expression is used in this file, and kicks in at measure 12. Could this explain the volume increase that you're hearing?
Sometimes files are sequenced/created with specific playback devices in mind. Thus, you may see (and hear) controllers used in files that sound great on some devices but horrendous on others. One example is Mod wheel. Garritan library instruments use Mod Wheel to control performance dynamics, and so help the performance to sound really good. Conversely, if I take one of my files that I've tweaked for GPO, and then use my regular MIDI device to play the file, it sounds horrendously wobbly .... until I set all the staves' Mod Wheels back to zero
So give it a shot, and see what controllers affect playback on your device. Composer makes it pretty easy to see this quickly, and fix it where needed
ttfn,
Sherry