Hi Robbie, the Recordo A system has been variously described as a 10-
or 12-level system. I have a few Recordo A rolls made by Mastertouch.
On examination I saw they did not punch all the expression combinations
so I wondered why. The graph in the attached design paper shows why.

With kind regards,
Paul Rumpf in Melbourne, Australia (The Down Under Land Locked Up!)

 [   Design paper
 [ https://www.mmdigest.com/Attachments/21/08/10/210810_205231_RecordoA-decibels.doc 
 [   Excel file
 [ https://www.mmdigest.com/Attachments/21/08/10/210810_205231_RecordoA-design.xls