I think good music makes a good game great so I want to get into composing music for videogames.I have a low-end keyboard with 100s of sounds on it but it's very hard to make complete tracks with. I have less than $100 to spend on a music program for the computer and after looking around I found Sequel 2. I like how it has many loops & sounds built into it. I'm wondering if and how you connect the keyboard I have (it has SD & USB slots) to Sequel 2. (Also, is this a good program in the first place? Any other recommendations?)

This is the keyboard here:

http://www.axemusic.com/product.asp?P_ID=19544&strPageHistory=search&strKeywords=Casio,keyboards&numPageStartPosition=1&strSearchCriteria=all&PT_ID=all

Sorry, double post

Honestly...this is what I prefer to use for most music projects.
http://cgi.ebay.com/SONY-MINI-PLAYSTATION-with-LCD-SCREEN_W0QQitemZ260430895966QQcmdZViewItemQQptZVideo_Games?hash=item3ca2e41b5e&_trksid=p3286.c0.m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|240%3A1318|301%3A1|293%3A1|294%3A50

http://cgi.ebay.com/MTV-MUSIC-GENERATOR-PLAYSTATION-1-2-3-COMPLETE-PS1-RARE_W0QQitemZ130308899361QQcmdZViewItemQQptZVideo_Games_Games?hash=item1e57040221&_trksid=p3286.c0.m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|240%3A1318|301%3A1|293%3A1|294%3A50

Small, compact, portable, and for most music formats, it's good enough.
Some of the sample sound qualities are a bit dated, but if you want to know how it sounds, here's two of my pieces of work for example:
This one is purely the machine.
http://www.garageband.com/mp3/Pencil_Dust-Nightmare.mp3?|pe1|S8LTM0LdsaSgZFC1Ymw

This one is the machine mixed with me playing a guitar over the top.
http://www.garageband.com/mp3/Pencil_Dust-Theos.mp3?|pe1|S8LTM0LdsaSuZlK1Zg

Do you have an audio interface (sound card) with midi in?

If so you can use the keyboard as a controller with midi, doesn't matter if the USB mode will be compatible or not.