It's been a few months since I last used Pinball Browser, so I don't know if the newer versions look different, but on the sound tab, scroll down to find the sound request you want to replace. Click on the sound request to highlight it, and then click on import. Browse for your file, and it will be replaced. When it finishes importing, you can double click the sound request to play it. It should play your new file. Below are the sound request numbers for both the LE/Prem and Pro:

LE/Prem v1.22 (sorry, I don't have the duration times handy)
#345 Battery
#431 Creeping Death
#502 Enter Sandman
#574 Fade to Black
#627 For Whom the Bell Tolls
#665 Fuel
#726 Master of Puppets
#794 One
#839 Sad But True
#915 Seek and Destroy
#994 End of the Line
#1059 The Unforgiven

Pro v1.22 (if these are incorrect, I copied them from someone else who posted in another thread; I don't have a pro)
343 Battery – 5:09
429 Creeping Death – 6:34
500 Enter Sandman – 5:30
572 Fade to Black – 6:56
625 For Whom the Bell Tolls – 5:09
663 Fuel – 4:29
724 Master of Puppets – 8:32
792 One – 7:24
843 Sad But True – 5:23
913 Seek and Destroy – 6:50
992 End of the Line – 7:51
1057 The Unforgiven – 6:26

Hope that helps

Hmmm. I'll have to check why I put #839. What was in 839 instead of SBT?

BTW, what songs did you replace?

Also, when the next code drops, all those numbers will probably be wrong again, and we'll have to do it again very soon According to Borg, they may be adding a few more songs, as well.

In the match call outs, there are two that are basically the same ("That snake just puked!"). I replaced one of them with a recording of my daughter saying in a worried voice, "Mommy, what happened to Fluffy?" It's not the actual, creepy "Mommy, where's Fluffy" from the song "Breadfan," which only hardcore Metallica fans would get, but most people get it when the snake pukes and that call out comes up.

There are 10 (I think) call outs for the flipper buttons during attract mode. I replaced one of them with my daughter saying, "Now I lay me down to sleep," and the "Sandman" riff playing softly behind it.

I tried the Breadfan original. It was too long for any of the match choices. It might work in a spot for a flipper button/attract mode. I didn't check that.