Adding a little noise

I am using Magick++

I would like to add some noise to an image, but the addNoise function adds
far too much noise.  

Using convert you can use -attenuate to cut it back, so how do we do this
with Magick++ which has no -attenuate option.

I'm an old film guy and the addNoise makes it look like you took 35mm Tri-X,
pushed it about 4 stops then blew it up to about 16x20...   


I'm more interested in grain that is barely noticeable.  

Any one have any ideas?  





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