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-rw-r--r--src/engine/DuplexPort.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/engine/DuplexPort.cpp b/src/engine/DuplexPort.cpp
index 5f5b8606..84d53be6 100644
--- a/src/engine/DuplexPort.cpp
+++ b/src/engine/DuplexPort.cpp
@@ -69,6 +69,8 @@ DuplexPort::pre_process(ProcessContext& context)
} else {
+ InputPort::pre_process(context);
+
for (uint32_t i=0; i < _poly; ++i)
_buffers->at(i)->prepare_read(context.start(), context.nframes());