Elektron Musical Instruments

Before posting this as a bug again I want to now if this behaviour is 
as designed. When I erase a track the machine is deleted too and the 
GND machine appears instead. My machine/track fx editing is lost and 
when I play the keyboard I hear nothing.
It makes more sense to me that erasing a track leaves the machine/ 
track fx settings intact.
(or you erase melody only, but when I do that function "erasing 
locks" appears and it seems that that is the case; only the locks are 
deleted)
Could you give a little help on these new functions Daniel? 

Ronald.