[sdiy] Wavetable info

[Linium]

On Vendredi 2 Janvier 2004 00:49, Tom Arnold wrote:
> On Thu, Jan 01, 2004 at 12:50:55PM -0700, Scott Gravenhorst wrote:
> > Hi all, and Happy New Year.
> >
> > I've often thought that it would be interesting to do waveform drawing,
> > but I've also wondered just how useful it is?
>
> For me its more an exercise rather then anything I have a goal with.
> I have some ideas for morphing from waveform to waveform over time and the
> like but at the moment this is more a Blinkenlights kinda project.
>
> It cant be that usefull or perhaps more synths would have been made to use
> it. Lets see, there was the Waveterm, a couple Roland units, cant forget
> the DSS1 ( although I try to, but that huge mass is still in the garage ),
> and theres that beastie that keeps showing up on ebay.
>
> I'm interested in the actual interface more then anything else.  The same
> code that can draw waveforms can draw envelopes for example....

Amusing, i had a DSS1 korg too :) (A quite advanced sampler but a pain to 
use).

And i am working on a "waveform oscillator" too. My project is to build an 
hybrid synthesizer around a computer and analog modules. Since i want a lot 
of oscillators, i had the idea to do some waveform oscillators instead of 
classical VCO given that it will be easier to build (lol). For the moment it 
will use the HS VCO core from modulus n°7, some CMOS counter+mux and a lot of 
caps to store the values... I intend to rely on the half wave trick to gain 
resolution. It means that the counter should go counting up and down in turn, 
and you should invert the wave on the second half. 

As pointed before, it is interesting to make the waveform varies. Korg not 
only did a nice sampler with analog filter (DSS1) they made the Wavestation 
later (I happen to have one too).  Before to be called wavesquencing it was 
known as vector synthesis (in fact just switching softly between 4 waves from 
a curve) but the intention is the same. Dave smith the engineer behing the WS 
doesn't need to be presented here  ? (just remind the Prophet VS).

PureData (a free synthesis software) allows you to draw with the mouse a 
waveform in an array. I already made kind of a "one cycle sampler" purely 
digital with that but it doesn't sound good (to me), i think that the 
computer is good for the interface though. My hybrid synth will rely on this 
functionnality, the values of the waveform will be send thru an interface to 
the  caps of all the "waveform oscillators". If the interface is speed enough 
the caps can be updated in real time to make some interesting 
wavesquencing... well, hopefully ;-) 

Linium