Path: utzoo!utgpu!watserv1!watmath!att!pacbell!pacbell.com!ames!ncar!tank!msuinfo!cpsin2!gurney
From: gurney@cpsin2.uucp (Eddy J Gurney)
Newsgroups: comp.sys.mac.programmer
Subject: How to get rid of clicking?
Summary: Would use Sound Manager but WaveTableSynth doesn't work on all Macs
Keywords: Sound Driver
Message-ID: <1990Jun4.020601.9644@msuinfo.cl.msu.edu>
Date: 4 Jun 90 02:06:01 GMT
Sender: news@msuinfo.cl.msu.edu
Organization: Michigan State University, East Lansing
Lines: 39

Well, I'm glad to say I'm making some progress generating sound on the Mac -
Thanks mostly to a some suggestions and some very helpful sample code from
a couple of c.s.m.programmer's.

Basically, I've given up on using the Sound Manager, at least until I get
some sample code on how that works.  (Does anyone know if the WaveFormSynth
is working on Mac Plus/SE's yet?  If not, it's probably useless to me anyway.
I'm running a Mac IIcx, but I want my program to run on at LEAST a Plus and
an SE.)

So... I'm using the Sound Driver to generate the simple tones I need.  I've
generated a really nice-sounding 256-byte sine-wave table, which I use as the 
waveform for the FourToneSynth.

Then I use StartSound to produce a few tones in a row, and, whatdya know,
I get TONE*crackle*TONE*crackle*TONE*crackle*.  (Sometimes.  Other times it
sounds perfect.)  IM II says something about getting rid of this, but I don't
quite understand how to do it correctly.  At most I need three tones in a
row (I'm only using two of the four channels, BTW) - sometimes there will be
a rest between the tones, sometimes, their will be none.

Also, while I'm posting... has anybody come up with a way to specify a
FREQUENCY to FTSoundRec.sound1Rate instead of the rate?  IM II gives the
equation: 
             frequency = FixMul(rate,FixRatio(22257,256))
I solved this for frequency, and got: (Actually, I had my HP-48SX do it.  I
didn't want to be flamed for not solving correctly :-)
             rate = FixRatio(frequency,FixRatio(22257,256))
Great you say, right?  BUT: FixRatio only accepts INTEGER parameters, so the
second FixRatio calculation doesn't work.  For now, I'm just using the integer
value '87', since (22257/256) = 86.94140625.  Any ideas on how to make this
more exact?  (Not that my application is that critical, I'm just curious :-)

Thanks for any help!  (MacDTS: I anxiously await seeing "SoundApp" in the
Sample Code on 'apple.com'!)

--
Eddy J. Gurney, N8FPW -- gurney@frith.egr.msu.edu   OR   17158EJG@MSU.BITNET
                         (reachable via uucp also)