<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:13px"><div class="" tabindex="0" id="yui_3_16_0_1_1440492105633_8546" style="display: table; width: 1164px; box-sizing: border-box; padding-top: 12px; padding-left: 0px; font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif;"><div class="" id="yui_3_16_0_1_1440492105633_8545" style="display: table-cell; width: auto; word-wrap: break-word; word-break: break-word;"><div id="yiv5550564824" class=""><div id="yui_3_16_0_1_1440492105633_8544" class=""><div id="yui_3_16_0_1_1440492105633_8543" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;" class=""><div id="yiv5550564824" class=""><div id="yiv5550564824yui_3_16_0_1_1440437980818_3230" class=""><div id="yiv5550564824yui_3_16_0_1_1440437980818_3229" class=""><div id="yiv5550564824yui_3_16_0_1_1440349760925_70078" class="">Hi S, </div><div id="yiv5550564824yui_3_16_0_1_1440349760925_70078" dir="ltr" class="">you would need to compensate by using the Fletcher-Munson equal-loudness contours – these could be put into tables or calculated by functions? </div><div id="yiv5550564824yui_3_16_0_1_1440349760925_70078" dir="ltr" class="">I believe a lot of this stuff was done already – I think Alex Porres has translated the Slaney Toolbox into Pd? There's also </div><div id="yiv5550564824yui_3_16_0_1_1440349760925_70078" dir="ltr" class="">the roughness stuff done by Pressnitzer, and a bunch of externals associated with that – probably a bit of loudness stuff in there. </div><div id="yiv5550564824yui_3_16_0_1_1440349760925_70078" dir="ltr" class="">The main thing to appreciate is that the ear is remarkably non-linear (the price we pay for having such a wide dynamic range!), and that the Fletcher-Munson equal-loudness contours change as average intensity increases–we hear a much different spectrum in a noisy environment than we do in a quiet environment. Of course, the F-M e-l contours are a bit simplistic as later research into the role of the the outer hair cells proves. Still, they're a good starting point. </div><div id="yiv5550564824yui_3_16_0_1_1440349760925_70078" dir="ltr" class="">Sounds like a cool project, I'd like to hear a sine sweep track at equal perceptual intensity from 20 Hz to 20 kHz :) </div><div id="yiv5550564824yui_3_16_0_1_1440349760925_70078" dir="ltr" class="">Cheers, Rich </div></div></div></div></div></div></div></div></div></div></body></html>