I've got a finished multi-percussion score with two staves (Vibes & Rack Combo A). On the Rack staff I'm using Wind Gong, Mark tree, and the 2 hi-hat sounds (open and closed). Everything inputs fine and sounds clear. However, on playback, I'm not hearing the hi-hat sounds. I started from the template and built the instruments from there (Sibelius 5.1, VDL 2.5, iMac 2.8 Ghz Intel Core 2 Duo, 4 GB Ram, OSX 10.5.2).