What does the green LED indicate in light guide?
In general, the light-guide shows the playable zone in blue, keyswitches in red (which usually toggle until pre-empted), yellow/orange/green are usually modifiers that are momentary and re-triggerable.
Without knowing exactly which VSTi instrument and or voice patch you're using it is impossible to answer definitively.
The manual for most libraries is included in the library directory folder under <Documents>.
Thanks ! That helped.
