A few ways you can use to quiet it down are:
1. Insulate all the duct mains with foil back insulation and use foil tape to hold it on. A practical method and good results, if your main ducts aren't covered up by drywall.
2. Have canvas connections installed close to the furnace on supply and return plenum ducts. This will mechanically isolate your furnace from the rest of the ductwork in regards to vibrations and some noise.
3. Slow down your noise-making-fan/blower...(sounds like you already tried that)...also keep in mind your furnace will be running longer to reach the set-point.
There are other methods, but these are the more practical ones.
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