Michael, I've never done it myself, but having 2 - 2488's myself, I did read some of the posts on the subject. You'll need to run a MIDI cable from one to the other. I'm not sure which one gets IN and which one gets OUT, but I know it's the first step. Then you have to set your preferred controlling machine as the 'MASTER' and the other one as the 'SLAVE'. I believe that's done in the MIDI menu. I think whatever you do on the MASTER automatically makes the SLAVE follow (i.e. Record,etc). You may have to physically set the SLAVE to Record also, but I'm not sure. Hope this gets you started and someone else can help with the details!
MLC