I've created a module to ensure that only low frequencies are sent to devices at the end of an "lfe"/"subwoofer" channel. This module allows the user to select the master channel, the low pass cutoff frequency (aka corner freq, -3dB freq) and the number of filter poles. The motivation for this is that I have a 5.1 surround amp/speaker setup but listen primarly to stereo sources. With pulseaudio's default, my subwoofer is unused and enabling the naive remixing send full band (20Hz-20kHz) to the sub which sounds like mud. :( By using this module, i can always use all speakers with the frequencies they are capable of reproducing. For those who primarily listen to Dolby, THX, etc. properly mastered surround movies or DVD-Audios, this is not advised. [Please note that I am neither a skilled programmer or signal processing engineer, so target your suggestions and advice in way that I just might understand. Much of this module was based on the advice of all the great folks on #pulseaudio.] The code is currently on github at https://github.com/justinzane/pulseaudio/blob/master/src/modules/module-lfe-lp.c I am grateful for any criticisms or suggestions about this, and I would like to get this merged into mainline sometime. Justin
