<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Sorry for the late posting, but I’d also recommend the mod-pitchshifter<div><br></div><div><a href="https://github.com/portalmod/mod-pitchshifter">https://github.com/portalmod/mod-pitchshifter</a></div><div><br></div><div>We have developed 4 plugins: Capo ( 1 to 7 semitones up), the SuperCapo (1 to 24 semitones up), Drop (1 to 12 semitones down) and SuperWhammy (continuous travel from -12 to 24 semitones)</div><div><br></div><div>They are a bit CPU hungry but sound quality is quite good.</div><div><br></div><div>Hope I’ve helped</div><div><br></div><div>Gianfranco</div><div>The MOD Team</div><div><br></div><div><br><div><div>Em 10/06/2014, à(s) 12:27, rosea grammostola <<a href="mailto:rosea.grammostola@gmail.com">rosea.grammostola@gmail.com</a>> escreveu:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">I'm not sure if real hardware stompboxes of this type are better then this plugin, but this might be the kind of sound I might like to buy a hardware stompbox for. Maybe I can test one somewhere and compare it with Gxdetune. Thanks for the comments Fons, tips for improvement are always welcome I think.<br>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Jun 8, 2014 at 1:34 PM, Fons Adriaensen <span dir="ltr"><<a href="mailto:fons@linuxaudio.org" target="_blank">fons@linuxaudio.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="">On Sun, Jun 08, 2014 at 12:36:17PM +0200, hermann meyer wrote:<br>
<br>
> Without downsampling it use (well, 4xtimes more then now) 8% dsp<br>
> load. Most costs in the original source comes from that used values<br>
> are not pre-calculated.<br>
> But indeed, the reason for downsampling is that the limited<br>
> frequency range makes it sound good,<br>
<br>
</div>because that removes most of the broadband junk that would be generated<br>
otherwise...<br>
<div class=""><br>
> and for guitar/bass 3kHz are<br>
> far more then enough when you would add a octave up/down to the<br>
> original sound.<br>
<br>
</div>True for bass and guitar.<br>
<br>
Still this algorithm is far from what it could be. I don't blame<br>
for you that, it's Bernsee who is missing the consequences of his<br>
own analysis (which is valid as far as it goes).<br>
<br>
Take alook at his table labeled 'pass #5'. The input signal is<br>
halfway between two bins. Assume we want one octave up. The expected<br>
output signal corresponds exactly to bin 225. For that signal, the<br>
output of the analysis FFT would be (similar to 'pass #1):<br>
<br>
bin amplitude<br>
------------------<br>
223 0.000<br>
224 0.500<br>
225 1.000<br>
226 0.500<br>
227 0.000<br>
<br>
And that is of course also what the correct input to the synthesis<br>
IFFT should be. Which is quite different from what the algorithm<br>
produces (by scaling each bin individually):<br>
<br>
bin amplitude<br>
-------------------<br>
222 0.170<br>
223 0.000<br>
224 0.849<br>
225 0.000<br>
226 0.849<br>
227 0.000<br>
228 0.170<br>
<br>
The result of this after the IFFT is the correct frequency, but<br>
with two periods of the window applied (it will be zero at the<br>
center).<br>
<br>
The frequency values that are calculated provide exactly the<br>
information required to avoid this and to do the correct<br>
calculation. But it's just thrown away.<br>
<div class="im HOEnZb"><br>
Ciao,<br>
<br>
--<br>
FA<br>
<br>
A world of exhaustive, reliable metadata would be an utopia.<br>
It's also a pipe-dream, founded on self-delusion, nerd hubris<br>
and hysterically inflated market opportunities. (Cory Doctorow)<br>
<br>
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