I have some weird quirks on my Yamaha TX81Z where the envelope parameters go in the opposite direction to the common ADSR. For example, the fastest attack is “31”, the slowest attack is “0”, the quickest release is “15” and the slowest release is “1”.
In order for the animation of the envelope on the device screen to represent the TX81Z envelopes some of the parameters would have to invert their animations.
Maybe "invert":true could be added to these envelope parameters.