The Logic Off Topic list

--- In logic-ot@y..., Spectro <spectro@o...> wrote:
> >Hi folks,
> >This may be an obvious question to some, but it's not that obvious 
to
> >me. The question is as follows:
> >I've got an old Kawai K4 synth with some cheasy and some great
> >sounds, :-). Now for some reason, which I don't understand, the
> >programmers have included some sine waves into the set of 
wavetables.
> >With wavetables I mean samples of one or two cycles. There are 9 
sine
> >waves included, starting with a basic one and the subsequent ones 
are
> >an octave, a quint above that, a quart above that one, a perfect
> >third, a dimished third, another diminished third, a second and
> >another second.
> >Now, they sound like they are just transposed, if you listen to 
them;
> >at C7 they alias like hell, :-)(cool effects, btw). What confuses 
me
> >is, why would they include these, when there is a option to 
transpose
> >the waves from -24 to +24, meaning that an octave is 12 steps? It
> >would be a waste of ROM I would say. Or is it about 'equal
> >temparature' that they've included these, given the fact that these
> >waves are not multisampled?
> >You can make nice organ sounds with these sines, especially when 
you
> >can combine four of these on the K4.
> 
> I may be incorrect, but believe the K4 implements a 'limited'
> additive synth capability. The whole point of the extra sine
> wavetables is to enable additive synthesis with the first
> however many harmonics. I don't know the machine, but would
> assume there are at least a few envelopes which can be assigned
> to control the amplitude of the various harmonics over time.

Now why didn't I think of that? :-). Yes, every one of those 4 
oscillators has it's own amplitude envelope, and a pair of those go 
through the filters with envelopes.
You've given me an idea now, ;-). You can put for of those 
oscillators in a program(single in K4 terms) and you can stack 8 of 
those programs in a multiprogram(multi in K4 terms). Only problem: my 
polyphony will be reduced to 1, :-D. Still can have a killer sound, 
maybe.

> >
> >Synth programming tip for the day: Try beefing up the sound of a
> >sawtooth wave with a sine wave, while keeping the amplitude of the
> >sine at 75% of the sawtooth wave. It can make the sound of a simple
> >saw wave sound 'thick', ;-).
> 
> A rough equivalent here would be to provide band limited gain to the
> fundamental frequency of the saw wave, which is more or less what
> adding the sine does.

That's right. Or you can emphasize one of the other harmonics.
Thanks,
Yoonchi.