TrackIter fwd = last.reverse();
for(unsigned i=0; i<beps.size(); ++i)
if(beps[i].track==fwd.track() && beps[i].track_ep==fwd.entry())
TrackIter fwd = last.reverse();
for(unsigned i=0; i<beps.size(); ++i)
if(beps[i].track==fwd.track() && beps[i].track_ep==fwd.entry())