This really has to be the first question:
Why modulating Qality, Gain & Freq of an EQ?
One of the most important things in music for me is dynamic & sound and for sure the combination of both.
I first found that sidechaining compressors and expanders to another source (bass kicked or pushed down with bassdrum or other way round, Keyboardpads changing volume with voice on another track etc. etc. makes music extremely more lively. Nowadays some people kill music with compressing it to death - making everything equal in volume...
I think one of the most important things we miss since Analog tapes left many studios is (very subtle) crossmodulation between different sources.
Good musicians even don't need any technical equipement for that - they react to other instruments on their instrument and this is what makes music living.
For me good music is the reaction of sounds to each other - like a communication. Even in hardest dance technos you'll find that extreme breathing & pumping-effects, when bass & other instruments are beaten down by bassdrum. That way the music get's a swing, a feeling, movement... (Sorry for my poor english)
=>
1. Moving gain of frequency bands is one thing you'll find in deessers, multiband-compressors & some other kinds of filter layouts...
Moving the gain of a certain frequency by the beat of the drums makes the sounds react to each other and so getting closer - they loose their distance, thei're not standing just one and then the other but both together in the music.
Of course it can be very helpfull to adjust gain automatically just when a frequency is too high - or you want to push it when it's too low...
So many possibilities...
2. With frequency it's as easy as with gain: Everybody knows filtermovements and I think they can be very nice when using them carefully on nearly every instrument. Why pushing only one frequency? Why not making it more lively and changing (in a certain area)?
For sure you can even build Auto WahWahs with moveq+ & there are other experimental ways which you will see & hear when the device is released...
3. Q is for sure the most subtle factor. It is something between the both others. It can be used to make a frequencyband more narrow (and with that lowering volume) or widen it and becoming more 'fat'. If you let these things depend on other sound sources you'll be able to get a kind of fatness-logic in that

Maybe one will change loudness corresponding to that, maybe one lets the frequency drop while the singer comes in...
whatever...
One has to hear it, but I like to try to express it in words

Martin
<font size=-1>[ This Message was edited by: MCCYRANO on 2006-10-10 13:56 ]</font>
<font size=-1>[ This Message was edited by: MCCYRANO on 2006-10-10 13:58 ]</font>