Garageband bass, treble and compression for Mac

I've been using Garageband on ipad for a few days and wanted to make the jump to Mac because I assumed it would be better but I was completely wrong?!

I am trying to simply turn down the compression along with adjusting the bass and treble levels on a track and it seems impossible on a mac, the ipad version is so simple to use with the levels being adjustable by slider.

This probably seems very silly but I'm a beginner and I cant seem to find anything online which shows you how to do this and I feel like I'm missing a trick.

Please help me