John Walsh wrote:
>
> >
> > Bruce Olson wrote:
> > >
> > > My ABC2WIN has a nice little button on the tool bar that plays
> > > A=440 Hz (verified on a 2 channel oscilloscope with 1 KHz reference
> > > square wave on the 2nd channel). Why does my ABC2WIN play that A in a
> > > tune at 880 Hz, (and all other notes) an octave too high?
> > >
> > > Bruce Olson
> > >........
> >
> > Henrik Norbeck's ABCMUS plays the correct frequencies (time the
> > highest peaks of the triple sawtooth waveform). Also timing is much
> > better than one can do with BASICS Sound command (at least the way
> > I've been using it). I presume that everyone knows that BASICs Sound
> > command puts a square wave into the computer's speaker.
> >
> > [I'm going to try faking BASICs Sound command into giving the right
> > timing. Going by the book doesn't work very well.]
> >
> > Bruce Olson
> >
>
> It could have something to do with the operating system, too. I
> recently changed computers, copied abcmus from windows 95 to a win 2000
> partition, and found that it now played at 1/6 speed. Identical program,
> bit for bit. Correct pitch, but six times slower. I contacted Henrik
> Norbeck, the author of abcmus, who said he'd run into it elsewhere with
> other versions of NT, and the fix was simply to set the speed for direct
> midi playback to 600%. Works fine... (!!!)
>
> Cheers,
> John Walsh
>
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My player programed in True Basic, True Basic system operated and
compiled versions, and Norbeck's AbcMus, all play frequencies correctly
on my computer. ABC2WIN on my computer plays them an octave high.
Bruce Olson
--
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