CesarsoundOne wrote:in digital sinth I can change the parameters of the 3 parts at the same time? For example, changing the waveform and the ADSR of the 3 parts at the same time?
Not currently, it's not so trivial to implement, but I might add that at some point.
What you can do since version 0.28 is create one partial, then copy and paste it to the second (and third) partial and then modify the parameters you want to be different on each partial.
You can either use the menu option Edit>Copy and then Edit>Paste, or simply by pressing the Ctrl-C keys to copy the current partial, then switch to the destination partial and then press Ctrl-V to paste.