: Equalizer design under Illustrator I would like to do manually an spectrum sound with Illustrator : What can I use ? Pencil ? Brush ? If yes what sort ? Thank you PS : I have a wacom

@Lee3735518

Draw the spectrum line

There are a few effects in illustrator you can use for this.
Look in the Effects menu for:


Stylize -> Scribble
Distort & Transform -> Roughen
Distort & Transform -> Zig-zag


You will have to play a bit with scale and each of the settings. Sometimes the results are very different if you draw a short or a long line.

The Scribble effect looks very promising. I would avoid values that make the line "loop" or go "back" on itself. The real sound diagrams don't do this.
You will get better results with your digitizer/tablet! The trick is to understand the basic properties of these diagrams.

Line styling

After you've got some lines you like, you can Expand Appearance to get a line with editable anchor points.
Play around with different types of brushes. Most of the brushes have settings like scale and spacing, that will help you avoid sharp edges.
Bristle brushes offer a lot of options and should get you there.

Another thing to look out for is the mitter limit on strokes or - Why stroke angles in Illustrator do not behave equally?

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