问了官方,以下是回复。感谢各位。
There is indeed an issue with the audio routing with the mono VST2 version, where the input is going straight to the output parallel to the signal passing through the EQ. So every EQ move you make is parallel. Solo'ing a band will only solo the signal going through the EQ, but the other signal will be audible as well.
We've reported this issue to Steinberg many times, but since they will abandon VST2 soon I'm afraid they will not fix it. Please use the VST3 version instead.