I just recently added 2 boss pedals on my board - a 1990 MIT Boss Bass Flanger BF-2B and a 1994 MIT Boss OC-2. I use a VT Bass pedal as my tone shaper and I always had to turn off the speaker sim because of the clanky highs and high mids. Ever since I put boss pedals in my chain, I noticed a lot less clank with speaker sim on. In fact, I might use the speaker sim from now on because I like how dirt sounds with it. Do Boss buffers reduce highs?