EA sbs (plus) sbr audio files

[lorak]

As most of you probably know, audio tracks in these kind of sbs (plus sbr) files can be played and extracted to wav with foobar2000 and the vgmstream extension. Just put the sbs and sbr files in the same folder both with the same name.

The sample file in the attachment comes from Madden 13 PS Vita. All the tracks in this particular sbs file are related to QB (American football) sounds. According to foobar2000, each track is encoded as ATRACT9, 60 kbps, 48kHz in one audio channel (mono).

Is there a way to encode a wav (or any other common audio format) file as ATRACT9, 60 kbps, 48kHz in one audio channel (mono) to make it work with this game?
Do you know if there is a way to replace an audio track in a sbs file with a custom one in foobar2000?
What is the relationship between these sbs and sbr files? I guess, the sbr file has the offsets or indexes of the audio tracks in the sbs file, but cannot link it clearly. 

Edited December 13 by lorak

[lorak]

I just noticed there is no attachment in my previous post. 😵
It is in this post though.

sample_sbs.zip