Roland V-Mixer VM-C7100 Quick Start Manual page 57

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If you have inserted the effects on an Input or Multi In channel
or a Flex Bus, turn [V1](CHANNEL SELECT) to select the
intended channel/bus, and press [F1](SET).
The insertion point and the send/return values have been set.
Using On-Board Effects
Effects can be inserted on
Flex Busses 1-8.
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