Possibly, if Yamaha are going to release voice packs for the T3, a selection of no compromise drumkits might be the FIRST thing they work on...

From the DTX and MotifXS series, they already HAVE a large library of drum samples, ready to go. It shouldn't take that much work, IMO...

Of ALL the sonic criticisms of the Tyros's, the drums are probably the thing most remark about. Shouldn't that make them the FIRST thing Yamaha make a voice pack for...?
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An arranger is just a tool. What matters is what you build with it..!