Hello!
After some years, finally I got an small hardware setup that freed me from making music on the computer (which is great and I love Ableton Live, but I work looking to a screen all day long and I´m easily distracted by the massive openess of the DAW).
So I now I want the OP-1/Octatrack/LXR Drumsynth/SP404SX/Microgranny/Dâm Drum 3/Korg R3/Doepfer Dark Energy/MPC 500/MFB-522/iPad talk with each other! 
(not necessarily all together :P).
My audio interface is an old M-Audio Firewire 410, but I don´t want to sync the MIDI with the computer, so I´m searching a dedicated MIDI interface that can help me sync that stuff - especially using the Octatrack as master and the samplers/drum machines (including the OP-1) as slaves. What do you recommend? I was thinking about the iConnectMIDI 4, but someone just suggested to me MIDI Solutions Quadra Thru, which appears to be a cheap and solid option.
Thanks a lot!