MecaStack does not design the damper itself.  The software only allows you to consider the effects of the damper (Weight, wind area and estimated damping) into the design, but you need to contact a Damper supplier to obtain estimates of the parameters.  Meca is a provider of dampers and can be of assistance with the supply of dampers for a specific project.   Typically a client does the design using MecaStack, and if they determine that the stack needs a damper, then they send us the MecaStack input file.  With this file we can recommend the best type of damper and then provide a quote for the supply of the damper.   

Here is a link to an article that goes into more detail on the topic of Tuned Mass Dampers on stacks.