Hi, thanks for all your help. I can finally play custom song on my mac, using the vid from chazswp, thank you ;-).
My pc is too old to work correctly, so it's good to have it on the mac.
I used the link (&app) posted above (github) to convert the song from pc to mac. But with one song (bath salts from highly suspect), I have the bend in reverse. (goes down in place of up).
If someone else has another method and can convert this song for me in mac version, i would really appreciate the help. It's been 3 very long days that I try to run custom dlcwith my pc or mac, now it's ok. But just this problem too figure out.