Audio equivalent of keying?

Hi, this is something I've wondered about from time to time, but I've never known how to search for it in the manual or elsewhere, so while I'm thinking of it, I thought I would ask here.
Is there an audio equivalent of keying? For example, I have a sound effect, say just a constant tone, and I want it to be inaudible, unless another sound comes in, and then the tone comes in in proportion to the levels of the second sound (or the opposite of that, so that the tone is always audible, but dissipates in proportion to the levels of any other sound that comes in). If something like this exists, what is it called? Is this something STP can do?
Oh, and a bonus question while I'm here. Probably not so hard to locate this in the manual or elsewhere if it exists (apologies to RTFM people...):
Is there a way to keyframe effects? (e.g., could I have tone shift over a duration, or have the frequency on ring shifter drift over a span of time, etc?) If so, how is that done?
Thanks much,
Matt

Volume keying - http://discussions.apple.com/thread.jspa?threadID=2077639&tstart=0
Bonus Answer - The same thing goes for nearly any effect, equalizers, reverb, etc.,
The additional step needed is to add the plug-in to your mixer and then view the plug-in parameters in the lower left pane. You need to check the ones you want to automate, this parameter will then show up in the envelopes for that track where you can key in your automation data.
!http://www.rdiv.com/screenshots/STP_pluginAutomation.jpg!
NOTE - all of this automation can be written in real-time by adjusting the desired control on-screen, either in the lower left pane or the plug-in itself - as long as you are in touch or latch automation mode (the toggle menu at the top of the screen).

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null
Message was edited by: macadamea

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Message was edited by: MacSinceEightySix

MacProCT wrote:
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http://www.ziksw.com/old_site/soundon/index.html
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In order to increase battery life, Mac OS X versions 10.1.2 through 10.1.5 turn off your computer's sound hardware when it is not used for 30 seconds. The delay in hearing sounds is the time it takes for the sound hardware to go from its low power mode to sound production.
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Message was edited by: MacSinceEightySix

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For Intel® High Definition Front Panel Audio
Pin Signal Name Description
1 PORT 1L Analog Port 1 - left channel (Microphone)
2 GND Ground
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5 PORT 2R Analog Port 2 - right channel (Headphone)
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10 SENSE2_RETURN Jack detection return for front panel (JACK2)
For AC-97 Front Panel Audio
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1 MIC Front panel microphone input signal (biased when supporting stereo microphone)
2 AUD_GND Ground used by analog
3 MIC_BIAS Microphone power / additional MIC input for stereo microphone support
4 AUD_GND Ground used by analog audio circuits
5 FP_OUT_R Right channel audio signal to front panel (headphone drive capable)
6 FP_RETURN_R Right channel audio signal return from front panel (when headphones unplugged)
7 AUD_5V Filtered +5 V used by analog audio circuits
8 KEY No pin
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10 FP_RETURN_L Left channel audio signal return from front panel (when headphones unplugged)

Audio equivalent of keying?

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