Lowering bass drum volume

[sugarplumsss]

Forgive me, but I've likely asked this question before.
Skip ahead these next 2 paragraphs if you want to get to it!

I'm painfully slow at grasping tyros - computers and internet and forums. I'm slow at others thing too.
Quite slow.. for many years I've never understood compression though it's been explained ... electricity seems to be yet another low aptitude for me

But I am way ahead of the bell curve on an odd array
I was a whiz at chemistry at 8 years of age
I always been respected as a musician on three families of instruments

So I am asking this question again
How to lower the bass drum in swing and bossa nova drum styles

I only use the drum parts - I play ALL other parts including bass parts

One problem is going into the midi notes within a style is tedious on a tyros screen
An app on computer Would speed things up

But I'm zero conversant with PC
i only have slight ability on mac OS X side

That's one issue