I had the same trouble some times ago: when I changed a parameter on voice 1 then voice 2 / 3 / 4 would get the same tweak.

Here is a clue : when inserting a midi track in live, it comes automatically set with midi from and send on all channels (all ins / all channels). Make sure your midi signal mirrors the A4 midi config (Elektron A4 channel 1 in / Elektron A4 channel 1 out, etc…)

That works though it is not really smooth this way (parameters drop at “0” value when loop restarts in recording mode). Also you then have to choose between “midi sources” to control the A4 (selectecting the A4 disengages Push).

There is another trouble with Push (but not exclusively). When you clear a sound on the A4, the aftertouch will be mapped to vibrato each and everytime. A work around is to create your own “default” sound, and load it when you would use “clear”.

Cheers !