Hi Narsh,
I had a GSP2101 for the longest time and only got rid of it after getting the 11 Rack. I must admit it was a little tricky to get it to play well with the 11 rack. I found that the the signal from the FX out from the GSP 2101 was not as high as the eleven rack would like (I tried rack and pedal modes and increasing the fx in/out from the 11 rack).
Eventually I found that if I took the Fx Out from the 11 rack to the input of the GSP2101 and the output of GSP2101 to FX in of 11 rack it was workable.
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I'm a practicing guitarist, one day I hope to get it right..