[sdiy] top octave gneration

[adam at hoodmusic.net]

i thught this to be a bonus of this design, i would be able to tune to
different scales and scale the whole top octave at once, even modulate
it with a LFO for vibrato, and a little VCO drift is ok, even if it will
cause ever D# down the keyboard to go out of tune, but it could also be
fun to just modulate the D# and leave the rest going normal. as for
PICs, i thought about it but that would give a phase lock on the top
octave and it would not give me all the fun controls i jsut mentioned

adam

harry bissell wrote:

> Hi Adam...
>
> There is no reason not to do it that way. I don't know
> about the long term stability of the 555 timers...that
> may be a real concern. You could make them easily
> adjustable and tune them with a musical instrument
> tuner every gig... Hey guitar players do it.
>
> An other approack would be to make your own Top Octave
> Generator.  You pick an integer series that
> approximates the 12th root of two (equal tempered
> scale).. Some old Journal of the Audio Engineering
> Society issues had Ralph W. Burnhams (sp?) approach...
>
> Some folk would suggest using a PIC mirco to do
> this...
>
> H^) harry
>
> --- adam at hoodmusic.net wrote:
> > hi
> >     i have been thinking about building an organ or
> > string synth for
> > awhile now and i was thinking of useing a few quad
> > 555 timers to create
> > the top octave and then divide it down for the rest
> > of the notes. would
> > there be any problems in going about it in this
> > method? or would there
> > be a better way to go about?
> >
> > adam
> >
> >
> >
>
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