[Colin Braley]

Well there are multiple ways you can go about this:

You can use the Keyframe Assistant called “Convert Audio to Keyframes.” This will create a null layer called “Audio Amplitude” in your comp. The null will have sliders on it representing the left channel’s audio amplitude, the right channel’s amplitude and the whole layer’s audio amplitude. You can then link layer properties such as scale, position etc. to these via expressions.

If you actully want to see the audio waveform in your comp you could try the Render>Audio Waveform effect.

Lastly, if you want to link layer properties to specific aspects of a song (such as the drum part etc.) you will need a plug in by trapcode called “sound keys”. It is a great (and easy to use) plug in.

~Colin

[Colin Braley]

Why don’t you just change the track type to the “perspective corner pin” option? Check out this tutorial for some info:
https://studio.adobe.com/us/tips/tip.jsp?p=1&id=100241&xml=aft65cornerpin

~Colin

[Colin Braley]

++ is called the “increment operator”. Basicially all it does is add one to a variable. — is the “decrement operator.” Let’s say you had a variable called i.
i++;
is the same as saying,
i = i + 1;

You will see the this kind of thing most often when you are using loops. Hope my info was what you were looking for.
~Colin

[Colin Braley]

++ is called the “increment operator”. Basicially all it does is add one to a variable. — is the “decrement operator.” Let’s say you had a variable called i.
i++;
is the same as saying,
i = i + 1;

You will see the this kind of thing most often when you are using loops. Hope my info was what you were looking for.
~Colin

[Colin Braley]

Are you applying the expression to the source text property of a text layer? If so, what error messages are you getting?
~Colin

[Colin Braley]

Are you applying the expression to the source text property of a text layer? If so, what error messages are you getting?
~Colin

[Colin Braley]

Try this as an expression for source text:

totalMinutes = 20;//Total time in minutes
beginVal = 0;
endVal = 5000;
//————————————–
fps = 1 / thisComp.frameDuration;
secs = 20 * (fps*2);

Math.floor(linear(time, 0, secs, beginVal, endVal + 1))

~Colin

[Colin Braley]

Try this as an expression for source text:

totalMinutes = 20;//Total time in minutes
beginVal = 0;
endVal = 5000;
//————————————–
fps = 1 / thisComp.frameDuration;
secs = 20 * (fps*2);

Math.floor(linear(time, 0, secs, beginVal, endVal + 1))

~Colin

[Colin Braley]

Put the videos in a precomp and then try the “radial wipe” effect to reveal them.
~Colin

[Colin Braley]

This is a fairly basic solution but if you have a bubble image you could simply link the position propert of the bubble to the bulge effect’s source point via expressions. You would want to use an expression something like this:

layer = thisComp.layer(“Bubble”).position;
fromComp(layer)

~Colin