No, a MIDI won't do it. MIDI is not audio, it is just a series of instructions to an audio synthesis device. To get audio off the VF80 and into your laptop you have three choices:
(i) Get the CD writer for the VF, you can then burn each tack as a .wav file onto a CD, transfer each file into n-Track and edit them;
(ii) Get a USB audio interface with an SPDIF digital input for the laptop. You can then transfer the audio two tracks at a time into the PC. When you load them into n-Track you'll find they will be synched sort of OK.
(iii) Get a 3.5mm stereo jack to 2 x 1/4" jack Y splitter lead. Pan the VF80 tracks alternately hard left and right. Play back two at a time (mute the others) and record onto n-Track. This will be complete crap because you'll have the devil of a job lining the tracks up and you're putting some pretty poor A/D conversion into the process, but it will give you something. Recording four clear clicks onto each track (record onto one and then copy them to the same place on every other track) at the start of the song will help you line them up.
Better still, forget (iii) above and just edit and mix down on the Fostex. Billisa who posts here has got very good results doing that - better than you'd get with your laptop setup. By way of background, the VF80's market positioning was as a stand alone device - unlike the MR8, it was not designed to be easily used with a PC, although it effectively can be with routes (i) or (ii) above.
