There seems to be some confusion on using multiple styles in a song. You can set up keystroke and MIDI triggers for any band
style / performance event that is loaded, and you can load multiple song styles per song. So, when jamming, you can call up any of the loaded band styles by issuing the proper trigger. JAMMER Live is set up to auto configure triggers for 2 loaded song styles (each with an intro, grooves, ending etc...). Depending upon the instrumentation in the styles you could conceivably load and use more. The limiting factor is the number of MIDI channels used. At any rate, loading a new song style in JAMMER Live is quick.

Nevertheless and unlike ROM based samples, the GM500 sounds do require pre-loading in gigasampler. This isn't the case with a hardware sound modules.

Of course you can always (pre)load once the complete GM500 library. Joe Hardy (on the gigasampler forum) did just that:

"I made a Performance which includes all 128 instruments plus the drum kit. On a 450 MHz machine it takes 4.0 minutes to load the Performance. (It also requires 196 Megs of RAM as a minimum.) The advantage of loading everything is that GS will respond to all 128 program change messages. Among other benefits, this will speed up play between songs. GigaStudio is expected to drastically reduce loading times which will make pre-loading even more attractive. Also, the new Effects in Studio should make it easy to produce killer arrangements."

BTW, the "Conexant Player" is "built in" to Gigasampler version 1.6 - it is not a stand alone program as many of us had thought