[LAU] MIDI sysex over Firewire - not supported by Jack MIDI?

Hello all I'm currently having problems backing up my MIDI devices - namely a Korg ER-1 drum machine. The device sends a MIDI Sysex dump, which I used to be able to receive and record in Qtractor through my M-Audio Audiophile 192 PCI interface. Now though, I've switched to a Firewire interface, the Edirol FA-101 - and the Sysex messages are no longer getting through. I can still send and record normal notes from my gear. The only difference I can see is that the MIDI now comes through JACK MIDI, not ALSA. I gather this is the way most Firewire cards work with Linux. I have tried recording using jack MIDI only, and using a2jmidid to get it through to ALSA. I've even tried this dedicated program, to no avail - http://www.christeck.de/wp/products/simple-sysexxer/ Does JACK MIDI not support sysex at all? Do I have to buy a USB MIDI interface just for my backups? :( Any help appreciated, as always cheers, Oliver