Hi,
while experimenting in taming the lo end of my guitar recordings i've figured out how well Reaper's ReaFir plugin can do this job:
this picture shows an example which i'm using on a grouped guitar track. The filter acts as hipass above 90 Hz and as well as 4:1 compressor (without makeup) on an subsequent range up to 300 Hz ...
In contrary to most (all ?) MBs this FIR-filter (used in compression mode) dynamically touches only exactly these frequencies, which exceeds the threshold-line (in red color).
An ordinary MB would lower the level of the entire(!) range you've defined to control your guitars lo end, if any of its frequencies jump over the threshold. Probably at cost of a bit of punch.
For example you've defined a MB lo band up to 250 Hz. If some parts of your guitar tracks exceeds only about 100 Hz, all frequencies below 250 Hz will be squeezed too. On other parts with 200 Hz overruns again the same entire 250 Hz range will be pushed down.
Under FIR-control with eg. a straight threshold line fom 90 Hz until 250 Hz located just a little bit above the normal (lo end-)level, the 100Hz and the 200Hz overruns will be tamed at the time without influence to any other frequency inside the defined range.
With FIR-filter you can remove the mudiness of your guitar tracks much more sensitive. And there is no rule to use an even threshold line, so if you want more control over some "wild" frequencies, you can dip the line on the correspondend positions a bit more ...
Because of its selective functionality, there is no attack and release setting (simply no need of it).
Beside your hearing you've also an optical control over level reduction. Original and reduced signal - both will be displayed (light yellow/yellow lines)
IMHO it's worth to try
- gMo -
while experimenting in taming the lo end of my guitar recordings i've figured out how well Reaper's ReaFir plugin can do this job:

this picture shows an example which i'm using on a grouped guitar track. The filter acts as hipass above 90 Hz and as well as 4:1 compressor (without makeup) on an subsequent range up to 300 Hz ...
In contrary to most (all ?) MBs this FIR-filter (used in compression mode) dynamically touches only exactly these frequencies, which exceeds the threshold-line (in red color).
An ordinary MB would lower the level of the entire(!) range you've defined to control your guitars lo end, if any of its frequencies jump over the threshold. Probably at cost of a bit of punch.
For example you've defined a MB lo band up to 250 Hz. If some parts of your guitar tracks exceeds only about 100 Hz, all frequencies below 250 Hz will be squeezed too. On other parts with 200 Hz overruns again the same entire 250 Hz range will be pushed down.
Under FIR-control with eg. a straight threshold line fom 90 Hz until 250 Hz located just a little bit above the normal (lo end-)level, the 100Hz and the 200Hz overruns will be tamed at the time without influence to any other frequency inside the defined range.
With FIR-filter you can remove the mudiness of your guitar tracks much more sensitive. And there is no rule to use an even threshold line, so if you want more control over some "wild" frequencies, you can dip the line on the correspondend positions a bit more ...
Because of its selective functionality, there is no attack and release setting (simply no need of it).
Beside your hearing you've also an optical control over level reduction. Original and reduced signal - both will be displayed (light yellow/yellow lines)
IMHO it's worth to try

- gMo -