There're some radio stations I'd like to have that for. The ones that crank the bass way up - very annoying. The women DJs sound like they've been smoking two packs a day since 8th grade.
Are you using the Rio Car tuner module? If so, take a look at the Hijack FAQ and look for the config.ini entry "disable_bassboost_fm" or something like it.
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Tony Fabris