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MathGroup Archive 1999

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about musical functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20070] about musical functions
  • From: "Postman" <cmannu at eternite.com>
  • Date: Wed, 29 Sep 1999 03:33:27 -0400
  • Organization: CompuServe Interactive Services
  • Sender: owner-wri-mathgroup at wolfram.com

Hi all,

I'm using Mathematica 3, and trying to play songs simultaneously.

I've read the composer's guide which is really good, but i don't find it
clear enough to make a function such as the one for scales (on part 7)...

I wanted mainly to play "accords", two different notes from a given scale in
a same time.


Scale is given in cents such as :
MeanChromatic = {0,76,193.2,310.3,386.3,503.4,579.5,
                696.6,772.6,889.7,1006.8,1082.9,1200}


and i want to play 76 and 772.6 in the same time....

The function :

PlayScale[scaleType_,startingFreq_,totalDuration_] :=
  Module[{scaleList,noteDuration},

    scaleList =
     Map[(N[startingFreq * 10^(#/(1200/Log[10,2]))])&,
      scaleType];
    noteDuration = Length[scaleList]/totalDuration;

    Play[
      Sin[ 2 Pi t scaleList[[ 1+Floor[t * noteDuration] ]] ],
       {t,0,totalDuration-.000001}]
  ];

Many thanks.







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