I'm pleased to inform you that Tyros4 Firmware Upgrade data ver1.10 has been released.

http://download.yamaha.com/search/produc...duct_id=1072947

Name: Tyros4 Firmware Upgrade Ver 1.10

Changes:
1) The upper limit of the following Custom Voice-related parameters has been increased.
-VOICE RAM: from 6,144 KB to 8,960 KB
-WAVE COUNT: from 8,192 to 9,999
-WAVEFORM COUNT: from 1,280 to 2,560