Abacus.... sorry, no Skype, yet (I prefer the written word).
It's not about how much or little sample RAM you have, it's about how fast it loads. My venerable Kurzweil loads it's RAM at about 1MB/sec, 2 to 4 times faster than a T2. Especially for live use (arranger's reason d'etre) the speed with which you can load a sample set in response to a request (rather than pre-loading before the gig) is of crucial importance....
The piano and string sounds Kurzweils are famous for are ROM sounds, so no loading time at all, but if you need an Irish bagpipe for a song (if your arranger doesn't have a good one) or a hip-hop drumkit and some slamming beats, the speed with which they load is critical, no matter if they are 4MB or 40MB.
I think someone informed me that if you maxed out the T2's RAM, it would take over an hour to load..... USB1 is WAY faster than that! I think I read that USB 1.1 maxes out at 1.5MB/sec, so it should be faster than my K2500, not 2 to 4X slower....... 512MB should load up in 6 minutes, NOT 30-40 min. Why is it so slow?
So...... smaller soundsets are necessary, but unfortunately newer soundsets are GBs in size because of computer speeds and streaming technology, but Yamaha provide no way to import Akai format samples, which, because Akai's had smaller RAM (usually 32MB max) are the perfect size to load into a live keyboard.
So you are kind of stuck between a rock and a hard place if you actually want to USE the provided sampler in a live situation, hence my call for better load time implementation.
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An arranger is just a tool. What matters is what you build with it..!