Quirk with sampler envelope on/off button

[d.healey]

If you select a sample in the mapping window and turn on one of the envelopes, gain for example, make some adjustments to it, and then select another sample the gain envelope "power" button will be off - which is correct because you haven't enabled an envelope for this sample yet - however pressing the power button turns on the button but doesn't display the envelope, you have to toggle it back off and on.