K5synth

Leslie wrote:
"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...

I uploaded
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@yahoogroups.com, "Leslie Sanford" <jabberdabber@h...>
wrote:
> >As for the Atari, I was able run both Leslie's Wavemaker - again
very
> >  nice (I like the FM section, it looks very useful.  BTW, is
there a
> >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
to the 
> program years ago (I wrote the program when I was just starting out
as a 
> programmer and was careless), and I haven't looked at programming
the Atari 
> 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
linear
> >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
> >transformation?
> 
> My formula is based on several assumptions:
> 
> First, that the K5's dynamic range is around 72db. This may be way
off, btw. 
> Once source I found puts the partials' dynamic range at around
37.5db 
> (http://home.swipnet.se/~w-90557/20_k5.html).
> 
> Second, a 10db increase in sound pressure represents a doubling of
the 
> perceived loudness 
>
(http://www.audiovideo101.com/dictionary/dictionar
y.asp?dictionaryid=128).
> 
> Third, that the K5's scale is decibel based. This isn't hard to
prove. Just 
> program your standard sawtooth into the K5 using a linear scale, and
you'll 
> hear that it is way too dark.
> 
> And fourth, that a doubling in linear amplitude of a partial
represents a 
> doubling in its perceived loudness. In other words, using the linear
scale, 
> a partial with the amplitude of 10 is twice as loud as a partial
with the 
> amplitude of 5.
> 
> So I worked out a table (excuse the HTML tags if you are reading
this in 
> plain text) to illustrate the conversion:
> 
> <pre>
> db         linear
> 0             1
> 10           2
> 20           4
> 30           8
> 40           16
> 50           32
> 60           64
> 70           128
> 72           147
> </pre>
> 
> I assume that the K5 has 12 bit resolution (again, this could be
off), so 
> that gives me 72.24719896 decibel range. Dividing this by the
number of 
> steps the K5 has, 99, and I get 0.729769686db per step and a maximum
linear 
> amplitude of 149.5744446.
> 
> Say we have a set of partials we want to convert to the K5. To make
this 
> easy, we'll limit the range of the partials' amplitudes to [0,
1.0]. 
> 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.
However, in 
> practise, I've found that this formula works very well. So I'm
satisfied 
> that my formula is a good working approximation of what is needed to
convert 
> linear values to the K5, at least until someone with more knowledge
can 
> provide a better formula. :-)
> 
> _________________________________________________________________
> FREE pop-up blocking with the new MSN Toolbar – get it now! 
> http://toolbar.msn.click-url.com/go/onm00200415ave/direct/01/