I've only seen the "sing like Cher" version of mod_ladspa but there are lots of plugins here: http://www.ladspa.org/ladspa_sdk/example_plugins.html, including filter.so which says that it's a low-pass and high-pass filter. I'd check that out to see if it might fit the bill.

-MC

On Fri, Jun 12, 2015 at 4:48 AM, Paul Atreides <paul.atreides83@googlemail.com> wrote:
Hi,

is there a simple way to apply a low pass filter to the bleg? The problem which I am having
is that some people who are hard of hearing tend to speak much louder in the upper frequency band
than usual which can be very annoying.

Thanks

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