SGI audio Frequently Asked Questions (FAQ)

This is one of the Silicon Graphics FAQ series, which consists of:

    SGI admin FAQ - IRIX system administration
    SGI apps FAQ - Applications and miscellaneous programming
    SGI audio FAQ - Audio applications and programming
    SGI diffs FAQ - Changes to the other FAQs since the last posting
    SGI graphics FAQ - Graphics and user environment customization
    SGI hardware FAQ - Hardware
    SGI impressario FAQ - IRIS Impressario
    SGI inventor FAQ - IRIS Inventor
    SGI misc FAQ - Introduction & miscellaneous information
    SGI movie FAQ - Movies
    SGI performer FAQ - IRIS Performer
    SGI pointer FAQ - Pointer to the other FAQs
    SGI security FAQ - IRIX security

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Topics covered in this FAQ:
---------------------------
   -1- How do I program the Motorola 56000 DSP on the Indigo (R3K and
       R4K)?
   -2- How do I connect my stereo to my Ind{igo,igo2,y}?
   -3- How do I change the volume of the audio out the back of my
       machine?
   -4- Indigo2 speaker seems quieter than my Indigo. Am I imagining
       things?
   -5- I need to crank up the input gain on Indigo2 to use the
       microphone successfully. What's the scoop?
   -6- The glossy paper says that Indigo2 and Indy have 4-channel input
       and output. That sounds really cool. How do I use it?
   -7- Okay, so 4-channels of input and output is great, but I need
       more. Can I get more channels of audio for my machine?
   -8- Now that I have IRIX 5.2, I can't seem to find audio.h and
       libaudio.a in order to compile my audio code. What gives?
   -9- I like the boot tune, but it's just a bit too loud. How do I tone
       it down a bit?
  -10- How can I change the output speaker/headphone volume from a shell
       script?
  -11- What 3rd party audio solutions exist for Silicon Graphics
       machines?
  -12- I'd like to write my own audio programs. How do I get started?
  -13- How can I get the keyboard beep out line out/digital out on
       Indigo2?
  -14- How do I suppress the keyboard bell (which *does* come out the
       line out and digital output) on an Indy?
  -15- Why does /dev/audio not work on my Ind{y,igo2,igo}?
  -16- Where can I get a MOD player for SGI?
  -17- I need audio for my Onyx. What are the details?
  -18- Why does my floating point signal processing routine, when given
       certain inputs, run incredibly slowly and consume all of the CPU
       in _system_ or _interrupt_ time?
  -19- What are the audio features of SGI machines?