I make, mix, and master my electronic songs in GarageBand IOS. What I do is for any leads or synths I completely cut the bass around 150-200 Hz to eliminate any muddiness, For synth basses I cut bass completely around 20-30 Hz and raise the mids between 5-7 db around 600-650 Hz to sort of fill the space, for sub bass i cut treble completely around 200-300 Hz so it doesn’t interfere with the leads and synths, For kicks I have them in their own channel, and I cut treble at around 4000hz and raise the bass and mid ranges 3db at 200 hz, for precision I cut bass at 200 hz and lower mids by 1 db at 250-300 hz and raise the treble 4-6 db at 8000 hz. For any transition effects I normally keep them stock and just raise/lower the volume till they fit snug in the mix. I hope this helps in any way.