pic/midi programming

[Dave Cramer]

On Fri, Oct 30, 2009 at 6:30 PM, Lennart Sorensen <
lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org> wrote:

> On Fri, Oct 30, 2009 at 03:58:13PM -0400, Dave Cramer wrote:
> > On Fri, Oct 30, 2009 at 3:50 PM, Mel Wilson <mwilson-4YeSL8/OYKRWk0Htik3J/w at public.gmane.org>
> wrote:
> >
> > > Lennart Sorensen wrote:
> > >
> > >> On Thu, Oct 29, 2009 at 03:13:24PM -0400, Mel Wilson wrote:
> > >>
> > >
> > >  If you lose MIDI and do the sound yourself, I'd think start with 3
> > >>>  fixed-pitch square waves for the drones and a tuned wave for the
>  chanter,
> > >>> followed by the rudiments of a low-pass filter.  It might fool a few
> people.
> > >>>
> > >>
> > >> The fixed pitch being two at about an A (and octave below the keynote
> > >> of the chanter)  and the other one being an octave below that.  A
> being
> > >> about 480Hz in this case, not 440.
> > >>
> > >
> > > Really!  Just short of a tone sharp.  I can change the numbers for
> that.  A
> > > MIDI solution can do it too, by manipulating the Fine Tuning parameter
> for
> > > its channel.
> > >
> > > The square waves so far are almost-but-not-quite-entirely-unlike pipes.
> > >  They will only fool people who want to be fooled, but I haven't done
> much
> > > about a high-cut filter yet.  I tried to enrich the sound by detuning
> the
> > > two high drone sounds by 1/8 semitone each way, but got an ugly beat at
> > > about 3/second.  Probably needs more subtlety, maybe an LFSR to shake
> up the
> > > detuning in a less repetitious way.
> > >
> > > The thing needs an ATmega128.  The -48, -168 etc. don't have enough
> timer
> > > output compares to do it nicely.
> > >
> >
> > Well pipers spend a whole lot of time doing exactly this, tuning their
> > drones ;)
>
> Of course for midi there is the fun that the scale on pipes is nothing
> like the equal tempered that the midi notes expect.  You will have to
> use a pitch bend on almost every note as well.
>
>
Here's some information that may be of help. These files are from bagpipe
writer. They have the midi notes

http://cityofoaks.home.netcom.com/tunes/AmazingGrace.bww

> --
> Len Sorensen
> --
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