Hi Sherry,
Thanks for the explanation and demo files. What your demo seems to say to me is:
(a) That GPO does not really use note velocity for volume control. It uses the 'Loudness' and 'Modulation' controls.
(b) Midi files that use note 'velocity' for volume control (eg BIAB) will not work correctly within GPO, unless 'velocity' controls are changed to either 'Loudness' or 'Modulation'.

Have I understood you correctly?

I notice on the Garritan web page that for some packages there are 'plug ins' to do this conversion of translating 'velocity' to what GPO requires.

Is there a feature like this already in Composer? Or do you know of a stand alone package that does this conversion (ie converts the midi file before it is read into Composer)?

Cheers ... Clyde