[sdiy] Wave terrain synthesis (was Re: Generating acyclic waveforms?)

[karl dalen]

Roland has approached this in some way by the use of tone layers,
try out Anttis Vector VST app, its surprisingly easy to make fades
that sounds like FM/PM. 

KD

--- Den ons 2010-03-24 skrev Tom Wiltshire <tom at electricdruid.net>:

> Från: Tom Wiltshire <tom at electricdruid.net>
> Ämne: [sdiy] Wave terrain synthesis (was Re: Generating acyclic waveforms?)
> Till: "Scott Nordlund" <gsn10 at hotmail.com>
> Kopia: synth-diy at dropmix.xs4all.nl
> Datum: onsdag 24 mars 2010 14.53
> I find it very interesting that this
> technique makes similar sounds to FM, since in my mind it is
> more closely related to wavetable synthesis than either of
> the nonlinear techniques you mention (waveshaping and FM). I
> can completely imagine that it is difficult to control or
> predict what you'll get out. Experimentation is good, but
> sometimes you're aiming for something particular and it
> would be nice to be able to get closer.
> 
> Thanks very much for a practical report on this.
> 
> T.
> 
> On 24 Mar 2010, at 03:46, Scott Nordlund wrote:
> 
> > 
> >> Simon Brouwer wrote:
> >>> I see two other ways:
> >>> - using wavetables (very long ones)
> >> I'd discounted wavetables just because they would
> have to be very long,
> >> but memory is cheap, so why not.
> >> 
> >> What about Wave Terrain synthesis? Is there an
> sdiy implementation
> >> anywhere? Load up a 2-d matrix with a surface of
> choice and then read
> >> linear subsections. Altering the start and end
> coordinates over time to
> >> vary the output waveform.
> >> 
> >> -Dave
> > 
> > I've tried wave terrain synthesis in Pure Data. 
> It's neat to think about,
> > but the results I've gotten aren't drastically
> different from FM or
> > waveshaping or similar things (you could kind of
> consider waveshaping and
> > FM to be subsets of wave terrain).  My
> implementation scanned a surface
> > (defined by an arbitrary equation, F(x,y)) with a sort
> of lissajous figure
> > that could be scaled, rotated, offset, etc.  To
> get something decent
> > sounding, I limited the surface and modulation to
> continuous, bounded
> > functions (lots of sin, cos, atan).  A surface
> with discontinuities or
> > singularities isn't going to sound so great.
> > 
> > Anyway, yes, there's plenty of room for inharmonics
> and animated and
> > complex sounding things, and it's nice that any of the
> inputs can be used
> > with envelopes or slow or fast modulation or whatever,
> but there's also
> > a lot of unintuitive messing about to avoid sudden and
> "unmusical" timbral
> > changes, or just to generally come up with something
> interesting.
> > 
> > The end result resembles something that might be more
> easily obtained from
> > FM/waveshaping with arbitrary waveforms.  In fact
> that might be a better
> > approach, because it's difficult to make an equation
> for an interesting
> > surface.
> > 
> > I'm not saying it's not interesting or potentially
> rewarding, but it's not
> > the revelation that I'd hoped for.  Imagine FM
> with several added layers
> > of confusion and obfuscation and you won't be too far
> off.
> >     
>         
>            
> >
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