Could it be that I saved these songs in the wrong way when I originally exported them to SMF? There didn't appear to be a choice of methods available.
The QS300 manual described the SMF export function as follows: "This comprises a single specified song in the Standard MIDI File format. The Standard MIDI File format is widely used by computer music software, sequencers, and synthesizers with built-in sequencers. This option provides data compatibility with such devices. Voice, output select, and play effect data is not saved with an SMF file.
I would think that "voice ... data is not saved with an SMF file" means that all of the MIDI channels are scrunched down to one, but I'm not sure about how your sequencer works.
What I do know is that I have successfully written MIDI files with Finale and imported them to Live with each MIDI channel going to a separate Live track. I also know that Live will not export
a single MIDI file with more than one channel. Grrr.