>Josh Steiner wrote:
>> Could someone tell me how you filter to get that legendary "talk-box"
>> sound.

I have one in my collection at http://www.werewolf.net/~hljmm/csound/
in the effects section.

Understanding the idea behind a talk box may help in simulating the sound.
I built a talk box by taking a small speaker and attaching a funnel to the
end.  A piece of plastic tubing connects between the end of the funnel and
your mouth.  The sound goes into a guitar amplifier, to increase the
harmonic content through distortion, into the talk box, out through the
funnel, into the tube, into your mouth where it is shaped by your vocal
tract, into a microphone, into a second amplifier or mixer.  The talk box
speaker must be powered so I had to connect a switch and a jack to the
guitar amp so that I could switch between driving power to the guitar amp
speaker and sending power to the talk box.

The first step is to increase the harmonic content.  This can be done
through waveshaping or using distort1.  I next found a book that had the
formant frequencies and amplitudes of several typical vowels.  I set up some
tables for these vowels.  I used another table to index the formant tables.
For example 1="ahh" 2="ooh" etc.  I used port to smoothly move from one
vowel to the next.

Don't confuse the talk-box with a vocoder which is another beast entirely.
The "talk-box" sound of the "Beastie Boys" is not your typical talk-box or
vocoder sound.  It is quite distinctive.

Good luck,
Hans Mikelson