Re: Hello - I just joined
"Man, I would love to see those!"
Here you go. I just uploaded some .pdf's and .jpg's in the file
section. My earlier e-mail was a bit off on what I actually had...
1) 300 waves/spectra from the Waldorf Micro Q in a .pdf. The file is
very high res and you can zoom in and clearly identify each of the 64
harmonics. It should be possible to manually translate these waves to
the K5 using something like graph paper and the K5 equation.
2) A lower res .pdf of all the K1 II waves. You can not count the
spectra like the Waldorf file, but you can get a good idea of the
harmonic distribution. I may be able to make a better file, but for
now this is the best I have.
3) I had the wave shapes, but not the spectra from the Virus (I think
it is the C but I am not sure). I am not sure how useful this will be
(Wavedraw?) but I thought I would post it anyway.
4) I added a .txt file with some links to more PPG FFT stuff.
This should give people some ideas at least. I may post one more .zip
file related to the Micro Q if it is not too big. Have fun.
--- In k5synth@..., "Leslie Sanford" <jabberdabber <at> h...>
> >As for the Atari, I was able run both Leslie's Wavemaker - again
> > nice (I like the FM section, it looks very useful. BTW, is
> >way to "slow down" (i.e. step through) the wave drawer?)
> Um... not sure. I'm embarrassed to say that I lost the source code
> program years ago (I wrote the program when I was just starting out
> programmer and was careless), and I haven't looked at programming
> in probably 5 years.
> >Also, I have some spectrum/waveforms in hard copy from the PPG
> >wavetables, the K1, and the Nord Lead.
> Man, I would love to see those!
> >It would be nice to resynth
> >some of these forms "by-hand". I read here that to translate
> >spectra amplitude to the K5 you have to do a transformation. Can
> >anyone (i.e. Leslie)tell me what the exact equation is to do the
> My formula is based on several assumptions:
> First, that the K5's dynamic range is around 72db. This may be way
> Once source I found puts the partials' dynamic range at around
> Second, a 10db increase in sound pressure represents a doubling of
> perceived loudness
> Third, that the K5's scale is decibel based. This isn't hard to
> program your standard sawtooth into the K5 using a linear scale, and
> hear that it is way too dark.
> And fourth, that a doubling in linear amplitude of a partial
> doubling in its perceived loudness. In other words, using the linear
> a partial with the amplitude of 10 is twice as loud as a partial
> amplitude of 5.
> So I worked out a table (excuse the HTML tags if you are reading
> plain text) to illustrate the conversion:
> db linear
> 0 1
> 10 2
> 20 4
> 30 8
> 40 16
> 50 32
> 60 64
> 70 128
> 72 147
> I assume that the K5 has 12 bit resolution (again, this could be
> that gives me 72.24719896 decibel range. Dividing this by the
> steps the K5 has, 99, and I get 0.729769686db per step and a maximum
> amplitude of 149.5744446.
> Say we have a set of partials we want to convert to the K5. To make
> easy, we'll limit the range of the partials' amplitudes to [0,
> Converting this to the K5 gives us:
> k5Amp = Log2(149.5744446 * partial) * 10 / step
> There are a few assumptions that I've made that could be off.
> practise, I've found that this formula works very well. So I'm
> that my formula is a good working approximation of what is needed to
> linear values to the K5, at least until someone with more knowledge
> provide a better formula.
> FREE pop-up blocking with the new MSN Toolbar get it now!
------------------------ Yahoo! Groups Sponsor --------------------~-->
Listen to Internet Radio! Access to your favorite Artists!
Click to listen to LAUNCHcast now!