[MUSIC PLAYING]
In this movie, we're going to look at making
asymmetrical distortion with Trash.
So I have just the Trash module turned on here.
And I have a drum beat, sounds like this.
[DRUM BEAT PLAYING]
And right now, I have symmetrical distortion.
Where when I change the wave shaper here for the positive quadrant,
these are the positive input value, mapping the output values that are also
positive, I have the same mapping here for negative values
of the input signal mapping to negative values at the output.
And the curve in this quadrant, is the same as the curve in this quadrant,
that symmetrical distortion.
But if I put this in bipolar mode, now I have the ability
to have one wave shaping curve for positive values at the input.
And a different wave shaping curve for negative values at the input.
So for example, I could create something like this just for positive values,
and negative values still have a unity gain function here.
[DRUM BEAT PLAYING]
Or I could have a very different kind of wave shaping curve.
Where the negative value's at the input.
[DRUM BEAT PLAYING]
I could even do things like swap polarities.
So here for example, many of the negative values at the input
will map to positive values at the output.
So this is a very different kind of distortion just
for negative values at the input, compared
to the positive values at the input.
[DRUM BEAT PLAYING]
This is the idea with asymmetrical distortion.
And any time I have the positive values of the input signal getting mapped one
way to the output, and the negative values
of the input signal getting mapped in a different way, that's
asymmetrical distortion.
Now I'm going to clear it all, and I could even
have something radical like this.
Where it now, all of the positive values get
mapped to a unity gain function of positive values at the output,
but all of the negative values get mapped to a unity gain function,
but inverted in polarity.
Because they're mapping to positive values at the output.
[DRUM BEAT PLAYING]
Again, a very different kind of sound, because I don't have negative
values at the output anymore.
[DRUM BEAT PLAYING]
So I've got lots and lots of different things I can do with this.
Any time I have anything different in the negative quadrant compared
to the positive quadrant, I have asymmetrical distortion.
And I can create some really kind of nasty and radical distortion this way.
[DRUM BEAT PLAYING]
Or I can create just gentle differences between positive and negative
amplitudes at the input, and have a different kind of color
to my distortion.
Now always remember, that if you have a lot of nasty distortion,
[DRUM BEAT PLAYING]
you can always go to the filter here, which is after the wave shaper,
and you can filter your distortion.
So you could take off some top end here.
And with these handles, you can change the shape of the filter.
And you can take off some low frequencies here as well.
So this sound,
[DRUM BEAT PLAYING]
can be a bit more contained.
And then of course, mix it with the original.
[DRUM BEAT PLAYING]
And you've got lots of possibilities to explore.
So that's asymmetrical, what they call bipolar wave shaping.
Where you have a different function for positive versus negative values
of the input signal.
[MUSIC PLAYING]