Hi kimdonghyuck, welcome to the FMOD forum!
Do you want to work out how many DSPs are connected to a channelgroup? To do this you would need to use ChannelGroup::getDSPHead. The ‘head’ is at the end of the effects so we need to traverse backwards (following inputs) until we reach a child channelgroup’s head. To get an input you use DSP::getInput which returns a DSPConnection. The use DSPConnection::getInput to get the next DSP. Stop counting once you reach a child’s channel group head (or a DSP with multiple inputs).
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