I think reloads occur after overflow, not before.

Machines/Enterprise/Dave.cpp

@@ -53,10 +53,11 @@ void Dave::get_samples(std::size_t number_of_samples, int16_t *target) {
 	// Step 1: divide input clock to 125,000 Hz (?)
 	for(size_t c = 0; c < number_of_samples; c++) {
 #define update_channel(x)								\
-		--channels_[x].count;							\
 		if(!channels_[x].count) {						\
 			channels_[x].output ^= true;				\
 			channels_[x].count = channels_[x].reload;	\
+		} else {										\
+			--channels_[x].count;						\
 		}
 
 		update_channel(0);

OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme

@@ -73,6 +73,7 @@
       debugDocumentVersioning = "YES"
       migratedStopOnEveryIssue = "YES"
       debugServiceExtension = "internal"
+      enableGPUShaderValidationMode = "2"
       allowLocationSimulation = "NO">
       <BuildableProductRunnable
          runnableDebuggingMode = "0">