You don't need to patch anything for slot 2. The IPS patch is for the ROM itself, which means you will only need to run it once (from the slot 1 card). After using this patch, it is preferred that you keep two separate versions of the game (they are fairly small anyway), as the use of the expansion songs mess with the song titles and may lead to some confusion.
You patch it with any standard IPS patcher. Search it up. There are some like LIPS (Lunar IPS IIRC >_>, or I may just be confusing the two as the same thing), and many that can be searched on google.
Give me a sec. It's uploading.
Here we go
http://rapidshare.com/files/50764255/daiga...ansion.ips.html