What were the last three IEM’s you either bought or tried?

A common problem with iPhones is that the volume controls aren’t precise enough. Apparently there are ways of adjusting the iPhone’s volume in smaller increments: see here and here.

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where did you get the foam sleeves made?

They weren’t foam sleeves, they were medical grade silicon. I got them from

I provided them with STL files of the 3D laser scans of my ear canals.

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