On Tue, Jul 14, 2009 at 03:25:39PM -0700, Justin Smith wrote: > Try running a white noise source through the filter, then look at the > spectral graph output in your favorite spectrum analysis program. > Since white noise should have a flat spectrum, any peaks and valleys > in the output are those of the filter. For a more 'musical' analysis, use Japa. It has either a logarithmic or perceptual frequency scale. Pink noise source is built-in, and if you set the analyser response to 'Proportional' it will show a flat spectrum for pink noise. It can also show the difference between two spectra, e.g. input and output of a filter, and this produces much more stable displays when using a noise test signal. For the filter, you could try on of the four Moog VCF plugins I wrote years ago. Apart from the resonant lowpass they will also add some juicy distortion at high levels, as does the original Moog filter and probably all real analog Wah processors. Frequency control is logarithmic, which is probably what you want, and there are separate control inputs to set the static frequency and resonance and their modulation. One problem could be that the modulation inputs require audio rate signals (the filter were designed for use in AMS) but that can be changed easily if you want. If you want to play with them use AMS. But Japa and the filters to be found at http://www.kokkinizita.net/linuxaudio/downloads The filter plugins are in the MCP set. -- FA Io lo dico sempre: l'Italia è troppo stretta e lunga. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
