<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Howdy guys (are there girls on this list?),<div><br></div><div>I'm looking to try to implement some guitar dsp in pd, mainly a preamp, tonestack, and speaker cabinet. I want to see if it's possible to get a better frequency response with my guitar without taking too much cpu or buying extra gear.</div><div><br></div><div>Anyway, I've found some great examples in the <a href="http://quitte.de/dsp/caps.html#Emulation">CAPS LADSPA plugins </a>and I'm looking at the C++ for the <a href="https://ccrma.stanford.edu/~dtyeh/tonestack/">tonestack</a>. I haven't used any of the filter primitives in PD before, so I don't know where to start. I haven't really done any lower level dsp aside from an intro to signal processing in undergrad (a while ago now).</div><div><br></div><div>Can anyone give me a pointer on how to implement this function using rpole~, rzero~, etc:? y = 2 * (a * (x - x[-2]) + c * y[-1] - b * y[-2]) It's the transposed Direct Form II digital filter from dsp/TDFII.h</div><div><br></div><div>... yes, I know I *could* run the plugin through [plugin~] but I prefer to keep things minimal. ANyway, this is an experiment.</div><div><div>
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>--------</div><div>Dan Wilcox</div><div><a href="http://danomatika.com">danomatika.com</a></div><div><a href="http://robotcowboy.com">robotcowboy.com</a></div><div><br></div></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
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