The Logic Off Topic list

>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.

>
>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.

HTH
S.