Steve, sorry I didn't mention I'm referring to Audacity v2.0.6 HPF which only provides a drop down menu with a minimum 6db to 12, 24, etc increments. But the roll off frequency of the old HPF version does go down to 1Hz and can increase in increments.steve wrote:Audacity's high pass filter is not limited to decibel increments. If you want, say 3.1415926536 Hz, then just type it in.Tim Lookingbill wrote:What's nice about Audacity's High Pass filter is that it can start at 1Hz but is limited in decibel increments
However, do note that 1 dB is a pretty small increment. Amplitude changes that are less than 1 dB are difficult to hear - in fact, many people can't discern differences of less than 1 dB.
I tried to upgrade to the most recent Audacity version but it makes Apple AU effects interface so buggy I can't use them plus the change in font style with bold & enlarged characters mucks up the layout of the overall interface. I now use Audacity mostly as an analytical tool and to check clipping and apply a better quality Limiter when needed.
My main point was that this low end frequency I find can't be surgically removed with these filters without affecting the nuances of the rest of the mids and highs Ronald appears to be concerned about. So what a compressor appears to do from what I'm hearing is it blends the surrounding low bass frequencies into the rest of the overall bass sound as a way to not make this frequency so pronounced, kind of acting like a notch curve but more spread out.
I could be wrong and just hearing things but it took live editing within Garageband using these effects to convince me sound perception is quite different from editing short isolated preview sections.