Although the T2 will import aif and wav, it does not import any multi-sample format, so to import a techno kit, for instance, or a good set of minimoog samples, whatever, you have to do a LOT of work to make your own keymaps, programming, etc.. Korg will import keymaps from Akai disks, amongst others, so a lot of the work is already done for you. That's what I mean by a closed system. It only reads T2 keymaps, no others.......

Wait til you try to program a good, multi-velocity drum kit by laboriously importing each and every wav, and prepare the keymap and velocity splits...... Talk about tedious!

Akai is the de facto standard for hardware samplers, and as such, any pro sampler should be able to import this format.......
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An arranger is just a tool. What matters is what you build with it..!