Forget RealBand or Realtracks for GR3 and some other VST apps such as Waves GTR, Jamstix etc. Use another sequencer. This issue (full VST compatibility) has been on the PG forum wishlists for probably the past 2-3 years. PG have consistently chosen to ignore customer requests to incorporate this (very fundamental) DAW feature - you unfortunately have no other option but to move on if you want to use most guitar or drum sim VST plugins.