Ok first of all I recommend you downgrade the 9500 pro graphics card if its just sound/music you need and spend the dosh on an extra 512MB of RAM and up the CPU to say an athlon 2800+. I also recommend you increase the harddrive to say 120GB. Soundcard will do fine, if you go for the EX version retail you will get a free copy of cubasis VST plus lots of other nice music software. You can download sf2 fonts from the net, open the soundfont bank manager in the creative program group and click on "bank". From there you can load new soundfonts and voice banks... note that you might need to increase the available virtual memory used for the soundfonts depending on how many you load.
Once loaded you can access them as with any other voices from the cubasis software, simply change the midioutput to SB audigy synth A or B and then choose the bank. Set your latency to say between 3 and 7 ms (should be easy enough on that spec pc). With the cubasis vst you can also play around with virtual instruments and synths (VST instruments) and basically emulate almost any synth in the world!!!!
Have fun!

For midi input I suggest a 2nd hand PSR keyboard with touch sensitivity, or if you can stretch a 6 or 7 octave master keyboard with aftertouch. Eitherway try and get something with mod and pitch bend wheels.

Simon

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