with ‘Follow Host’ Enabled, your EZdrummer 2 plug-in should slave to the Cubase Timeline. However, though EZdrummer 2 will follow Tempo changes these are not reflected on your EZdrummer 2 Song Track, neither are Time Signature changes. Should you consider upgrading to EZdrummer 3, know that EZdrummer 3 has got the possibility to Import Tempo and Time signature changes to it’s internal Song Track and these can also be manually edited.
