can’t thank you more, udev fixed the last missing bit in completing my setup! 
maybe interesting for others:
to create a udev rule you need to know some ids of your device. i used lsusb to find out idVendor and idProduct of the minilogue (Bus 001 Device 009: ID 0944:012c KORG, Inc.) where the first part of the 8 digit id is idVendor and the second part idProduct).
then i created the file /etc/udev/rules.d/50-minilogue.rules with the following contents:
ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0944", ATTR{idProduct}=="012c", RUN+="/usr/bin/aconnect Pyramid minilogue:1"
ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0944", ATTR{idProduct}=="012c", RUN+="/usr/bin/aconnect minilogue:1 Pyramid"
and all the magic will be done when you connect the device.
once again, @Giedrius can’t thank you more for your patience. big ups!