The RCO runs study trips abroad - a splendid opportunity to play organ repertoire on the instruments for which it was written.  Robbie Carroll went on a recent RCO study trip to Germany, and here's his personal account. "Repertoire takes on an entirely new meaning, once heard in its original context," says Robbie.  The RCO provided him with a bursary to go on the trip to Germany, and he was delighted at the opportunity.   "I have strongly believed in the importance of playing organ repertoire on the instruments for which it was written, and here was a chance to…