Mellotronists

In a message dated 29/06/2006 04:47:58 GMT Standard Time, easle12@...  
writes:

I'm  quite sure that the Cedar system favored by Martin
and John works wonders  at this idea since they have
tackled the whole pitching issue in many ways.  I once
saw a demo of Cedar at a trade show and was very, very
impressed.  
Can someone tell me what the Cedar system is?
Cheers.
Andy K