Lock symbol on drum rack?

[jasper]

I wanted to copy a simpler to another drum pad in this DrumRack,
but when I hold the ALT key, a lock symbol appers on the Drum pad.

[[jur]]

That because holding ALT in this situation enters the similarity sample swapping feature (i.e it's a momentary equivalent to activating the similarity swap button in the drum rack header).
The lock button is to exclude pads from swapping.