expression help, linking audio to scale height only

[Filip Vandueren]

Assuming a is the variable that points to the audio amplitude and on which you have done your basic math,

[a, value[1]] // for Y scaling
or
[value[0],a] // for X scaling

[Amz370]

ok well so far this is the expression and what ive begun to figure our

expression when linked or “whiped’ to audio amplitude, the layer in question starts at about 15%
temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
[temp, temp]

i can modify the width by adding a # afther temp tem for instance

temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
[temp, temp]+20
but the width still stays the same, what i want to do is A increase the size to 100% all around, and then be able to change just width and height

once again thanks for any help

[Amz370]

thankyou mr vandueren, i apreciate it

[Filip Vandueren]

You could also use

[value[0], value[1] + temp]

starting off with a scale of [100,100]

[Mike Clasby]

Since you know the basics, when you Alt Click, the stop watch, then pickwhip to the slider on the Audio Keyframes layer you get an expression like this:

temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
[temp, temp]

And the changes are tiny, I can’t see the layer, it shrank so much.

Now select the first temp in the [temp, temp] and pick whip tat to the x scale, giving you:

temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
[scale[0], temp]

Do the same for the second temp in [scale[0], temp], giving you:
temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
[scale[0], scale[1]]

This expression is just giving it the original scale, now we add in the temp to the y scale dimension:

temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
[scale[0],scale[1]+ temp]

I had to multiply by 10 to see the changes:
temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
[scale[0], scale[1]+temp*10]

Adjust away.

[Mike Clasby]

yikes, I didn’t see this was already answered.

[Amz370]

ok every one ive figured it out with filips help, but something else had to be done other wise it still scales at 15% from start and still modifies only one or the other

this is my current expression:
temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
[temp+[85], temp=100]

heres what the numbers represent for all those enquiring in the future

the 85 is an “arbitrary” number that effects the scaling. i say arbitrary because it’s relative to the project. i chose 85 because my lowest % when neither “temp” settings are changed was around 15, so 85 sets a base percentage of 100.

the 100 is the percentage i set the other value to and it will stay perminant. no matter what changes i do or adjust.

i will keep this post updated with what i discover, and i will hopfully be posting the short vid i make with these test expressions when ive finished, any question on what im doing feel free to post

[Amz370]

ok so im loving the info, and im very sorry for posting and reposting so quickly, but i have one last request:

so everything looks awsome, and im amazed with how easy expressions truly are, i supos ei try to overcomplicate, but there is one problem, as the image im minipulating is a buidling the horizontal shif looks great but the vertical one is what i have a problem with, as the house grows psat it’s foundation, now if this was rotation id siplay change anchorpoints, but is there a “anchorpoint” for size changing so the builing only stretches upwards and not downwards

once again im in your debt

[Filip Vandueren]

Just place the anchorpoint at the bottom edge of the layer, that way it only scales up.

[Amz370]

ok well ive been trying this but im not used to anchor points with a.e. and i don’t know how to adjust it to the point where it doesnt allow it to scale up