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So I guess the fact that if high frequencies or somewhat diminished, it means that the overdrive effect produced by the LPB is more on the mild side then on the harsh side, am I right?
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Maybe... The higher frequencies tend to be where "harshness" comes from, but it's also the frequency zone where "clarity" seems to live.
For what it's worth, impedance isn't just about rolling off the top end. I'm no expert on this topic, but
this article does a great job of explaining the concept and walking readers through an example (in this case, the LBP circuit).
Essentially, a pedal with low input impedance on a pedal filters out more of the original pickup signal (or whatever signal source precedes this pedal) compared to a pedal with high input impedance. I sloppily interpret that as less of the instrument's "pure" tone being passed along to the next step in the chain.
Again, that may result in a pleasing, less harsh clipping tone generated by the amp. However, if your bass's fundamental output tone is really good, you'll "preserve" more of it throughout the signal chain if using a booster with a high input impedance. (Other TB'ers: please feel free to correct any info here -- I'm offering my interpretation.)
Dunno; the above may be a lot of unnecessary under-the-hood info. The short answer: find some way to try out a few booster pedals side by side -- trust your ears when picking the right one for your setup.
Cheers.
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