Bc2000 (for the BCF2000 & BCR2000)

Hi. 
Anyone know Can I set negative values ​​in the sysex variables with bcmanager ? I can not find information in the documentation , this is not possible ?.
For example, I need configure a sysex for parámeter "VCF Freq. by Env 1 Amount", with: 
"$F0H $10H $06H $06H $16H val $F7H" where val is (sign + )7bits value
How I can configure this?

Thanks, greetings