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7.2 Controlling FX
# Controlling FX
It is also possible to control FX, although this is achieved in a
slightly different way:
```
with_fx :reverb do |r|
play 50
sleep 0.5
control r, mix: 0.7
play 55
sleep 1
control r, mix: 0.9
sleep 1
play 62
end
```
Instead of using a variable, we use the goalpost parameters of the
do/end block. Inside the `|` bars, we need to specify a unique name
for our running FX which we then reference from the containing do/end
block. This behaviour is identical to using parameterised functions.
Now go and control some synths and FX!
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