Attack and Release rates
The initial attack of a note can be adjusted to more slowly "fade in". To do this, you send the plugin an Attack Rate (CC number 73) midi message. A value of 0 sets the attack rate as short as possible. Higher values cause notes to more slowly fade in.
The trailing sound (release) of a note can also be adjusted to more slowly "fade out". To do this, you send the plugin a Release Rate (CC number 72) midi message. A value of 0 sets the release rate as short as possible. Higher values cause notes to more slowly fade out.
Note: Release affects only instruments whose sound naturally fades out (decays), such as guitar, piano, timpani, glock, etc. Instruments such as brass and wind do not have a release rate.