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I have the following Mathematica animation:

Animate[Plot[k*x^2, {x, -2, 2}, 
  PlotRange -> {{-2, 2}, {-10, 10}}], {k, -2, 2, 0.1}]

I also have a sound file in the same Mathematica file, which is A VERY SHORT music clip, in "wav" format. The clip is about 32 seconds long. Now I want to integrate this sound file into the above animation:

The following command will do the job, but it will make the animation WAY TOO sluggish, and almost useless:

Animate[Plot[k*x^2, {x, -2, 2}, PlotRange -> {{-2, 2}, {-10, 10}}, 
  Epilog -> {EmitSound[snd]}], {k, -2, 2, 0.1}]

Could you please suugest a better way of doing it? Thank you very much!

share|improve this question
How long is the .wav file? Do you need it to play continuously during animation or only at the beginning/end ? – Vitaliy Kaurov Sep 9 '12 at 3:47
Welcome to Mathematica.SE! I suggest the following: 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Read the FAQs! 3) When you see good Q&A, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. ALSO, remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign` – Vitaliy Kaurov Sep 9 '12 at 4:46
up vote 5 down vote accepted

This is one way to control the sound emission. Import a short .WAV file:

sound = Import[ "ExampleData/rule30.wav" ]

enter image description here

Now make sound only when your animation control reaches some value - k=0 or k=1 in this case:

Animate[If[k == 0 || k == 1, EmitSound[sound]];
 Plot[k*x^2, {x, -2, 2}, PlotRange -> {{-2, 2}, {-10, 10}}],
 {k, -2, 2, 0.1, AnimationRate -> 1, AnimationRunning -> False}]

enter image description here

share|improve this answer
Dear Mr. Vitaliy Kaurov, Thank you very much for your help. It works. I still have a question related to your answer. I will ask you later. I was slightly confused about the use of semicolon (;) after the EmitSound[sound]] command, and all that is included within the Animate command. I have never used such within an Animate command. I will try to understand it myself - if not perhaps I can ask you again. Still, thank you so much! Tim – – Tim Sep 9 '12 at 5:31
PS: You had asked how long is the wav file. Mine was about 32 seconds long. Using your method, it plays again and again without a problem. A second question is that can I cut off the music for certain values of k, and again restart it when k equals the previous values? I was just wondering. What is the Mathematica command to make a sound silent, in other words? Thanks in advance – Tim Sep 9 '12 at 5:34
@Tim , I will ponder about your question a bit. Meanwhile it maybe worth posting it as a separate question. Because it is a good question and also maybe someone already knows the answer. – Vitaliy Kaurov Sep 9 '12 at 6:49

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