Problems With Finale Files & Midi Interface, Studio 4 vs MIDIMAN Options

[K-note]

My MIDI files sometimes drop notes using Studio 4. Tried configuring using both modem & printer ports. Could not hear any difference and using both ports seemed to cause really maddening problems elsewhere.
Other than the usual (shortening note stop times, etc.) any suggestions?

I have a USB MIDIMAN (1 in-1 out). Might I get better results with it.
My music is complex and the drop-outs seem to always occur after a series of very fast notes.

For whatever it is worth, am running a beige G3 with sys. 9.0.4. Automedia III & SampleCell PCI cards. Use Finale 2001 for most of my sequencing.

Thanks for any suggestions!