You can have MIDI sync on a 4 track... Only probelem is you turn it into a 3 track as track 4 will become the sync track.
Essentially you can squeze 4 tracks out of it by boucing 2 tracks on to 1 track leaving the other two then free.
That's what the red and black box on my shelf is

Works a treat... Stripe the tape and off we go

It's cool to some times work with the 4 track for a change.. The Fostex has a 8 input mixer which is nice, the MIDI can be synced to the tape and the 4 track can concentrate the stuff you can't MIDI like guitars. vox etc
I don't see much point in using a MPC with a 4 track if all you are tracking is errm the MPC and nothing else...I mean what's the point? The MPC already has it's own mixer, FX and ish Just record the stereo out.
Now days I do pretty much what BG Beats said in that if I want that tape tone (And I DO like the hiss) I will record the main mix out from the mixer into the 4 track as a stereo mix then back to a DAW or something.
Sounds like this...
http://soundcloud.com/martin_bell/epsamerica2As to things recorded on a 4 track this is probs the most famous one...
http://tascam.com/news/display/226/Wu-Tang's 36 Chambers also was recorded on a Tascam if I'm not mistaken...