the next step i want to do is multitrack record my Eurorack system into Reaper,for further processing finaliing,would getting a Expert Sleepers ES-9 usb interface be the easiest way?
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it's definitely one of the easiest ways - if there is more than enough i/o and you don't already have an audio interface and you have spare rack space then it's probably a good buy for you
Utility modules are the inexpensive, dull polish that makes the expensive, shiny modules actually shine!!!
If the objective is to get the audio back into the DAW with the least hassle, yes, go with the ES-9. It'll also open up some possibilities for controlling the modular via the DAW IF you can get Reaper to speak proper CV/gate/trig/clock outputs. I would presume that the ES-9 comes with a copy of Silent Way, though, so the big question isn't so much whether the ES-9 will work, but whether Reaper and Silent Way can play nice with each other.
silent way is an optional extra
Hah...so it is. Although...you'd think that Expert Sleepers would toss a copy in with modules that use it. Would definitely be a plus for them, as having the total package on hand would likely get more users interested in this sort of control method.