This block represents an ADSR envelop.

The input of th eblock is binary which means that 0 is understood as low input level and anything else as high level.
When setting the parameters of the block make sure to take into account the time refresh of the graph. In other words, setting an attack time to 2 ms, the block will not work as you expect as the refresh time of the graph is 8-16 ms.

Here is an example of how you can use an ADSR block:

The parameters of the block are explained in the following figure:

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