diff --git a/src/lib_modules/core/output.hpp b/src/lib_modules/core/output.hpp
index 4de714aa..416b0349 100644
--- a/src/lib_modules/core/output.hpp
+++ b/src/lib_modules/core/output.hpp
@@ -75,18 +75,21 @@ class IOutputCap {
 protected:
 	template <typename InstanceType, typename ...Args>
 	InstanceType* addOutput(Args&&... args) {
-		auto p = createOutput<InstanceType>(getAllocatorSize(), std::forward<Args>(args)...);
-		addOutputInternal(p);
+		auto p = createOutput<InstanceType>(allocatorSize, std::forward<Args>(args)...);
+		outputs.push_back(uptr(p));
 		return safe_cast<InstanceType>(p);
 	}
 
-	virtual size_t getAllocatorSize() const = 0;
-	virtual void addOutputInternal(IOutput *p) = 0;
+	/*FIXME: we need to have factories to move these back to the implementation - otherwise pins created from the constructor may crash*/
+	std::vector<std::unique_ptr<IOutput>> outputs;
+	/*const*/ size_t allocatorSize;
 };
 
 class OutputCap : public virtual IOutputCap {
 	public:
-		OutputCap(size_t allocatorSize) : allocatorSize(allocatorSize) {}
+		OutputCap(size_t allocatorSize) {
+			this->allocatorSize = allocatorSize;
+		}
 		virtual ~OutputCap() noexcept(false) {}
 
 		virtual size_t getNumOutputs() const override {
@@ -95,19 +98,6 @@ class OutputCap : public virtual IOutputCap {
 		virtual IOutput* getOutput(size_t i) const override {
 			return outputs[i].get();
 		}
-
-protected:
-	virtual size_t getAllocatorSize() const override {
-		assert(allocatorSize > 0);
-		return allocatorSize;
-	}
-	virtual void addOutputInternal(IOutput *p) override {
-		outputs.push_back(uptr(p));
-	}
-
-private:
-	std::vector<std::unique_ptr<IOutput>> outputs;
-	const size_t allocatorSize;
 };
 
 }
diff --git a/src/lib_modules/utils/helper.hpp b/src/lib_modules/utils/helper.hpp
index dadd3300..b81b89ea 100644
--- a/src/lib_modules/utils/helper.hpp
+++ b/src/lib_modules/utils/helper.hpp
@@ -10,7 +10,7 @@ namespace Modules {
 
 /* this default factory creates output pins with the default output - create another one for other uses such as low latency */
 template <typename InstanceType>
-struct ModuleDefault : public virtual OutputCap, public virtual InstanceType {
+struct ModuleDefault : public OutputCap, public InstanceType {
 	template <typename ...Args>
 	ModuleDefault(size_t allocatorSize, Args&&... args) : OutputCap(allocatorSize), InstanceType(std::forward<Args>(args)...) {}
 };
diff --git a/src/lib_modules/utils/pipeline.cpp b/src/lib_modules/utils/pipeline.cpp
index 028e40ea..38085838 100644
--- a/src/lib_modules/utils/pipeline.cpp
+++ b/src/lib_modules/utils/pipeline.cpp
@@ -53,18 +53,8 @@ class PipelinedInput : public IInput {
 		IProcessExecutor &executor;
 };
 
-/* Fake: requested by IOuputCap */
-struct OutputCapFake : public virtual IOutputCap {
-	virtual size_t getAllocatorSize() const override final {
-		throw Exception("getAllocatorSize() not implemented for Pipeline");
-	}
-	virtual void addOutputInternal(IOutput *p) override final {
-		throw Exception("addOutputInternal() not implemented for Pipeline");
-	}
-};
-
 /* Wrapper around the module. */
-class PipelinedModule : public ICompletionNotifier, public IPipelinedModule, public InputCap, public OutputCapFake {
+class PipelinedModule : public ICompletionNotifier, public IPipelinedModule, public InputCap {
 public:
 	/* take ownership of module */
 	PipelinedModule(IModule *module, ICompletionNotifier *notify)