SOLVED!! 
It was a question about VA keypress timing and SH4 polling. I used the commands "press and release" keys, and SH4 needs bit more pressing time. It must be at least a pressing time of 0,2 seconds to let SH4 recognize the command, so setting "hold for 0,2 seconds" at least before releasing key solved the trouble with all commands. I found tips about it in Voice Attack forums
Hope this info will be of use for somebody
