Yes it could be done: the Trinity "files" partition is in FAT format and fully accessible by a PC: I have an external HD I use for my Trinity+ When I've downloaded new stuff, I connect it to my PC via the SCSI card and fill the hard disk with the new data. Then I reconnect the HD to my Trinity.
That's what I call "swapping a SCSI device between a PC and a Trinity"

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Regards,
Xavier
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Alchemist - the Korg Trinity to Triton PCG and SNG converter -
http://alchemist.sourceforge.net