|  | Audacity 3.2.0
    | 
The <something>CommandType classes are classes which are going away. They all provided a BuildSignature (what parameters they accept) and Name, but that is now replaced by the AudacityCommand interface. 
  
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The <something>CommandType classes are classes which are going away. They all provided a BuildSignature (what parameters they accept) and Name, but that is now replaced by the AudacityCommand interface. 
 
We in effect merge the <something>CommandType classes into the <something>Command classes.