Add PulseGenerator::isHigh() method.

include/dsp/digital.hpp

@@ -172,7 +172,7 @@ struct PulseGenerator {
 		remaining = 0.f;
 	}
 
-	/** Advances the state by `deltaTime`. Returns whether the pulse is in the HIGH state. */
+	/** Advances the state by `deltaTime`. Returns whether the pulse was in the HIGH state before stepping. */
 	bool process(float deltaTime) {
 		if (remaining > 0.f) {
 			remaining -= deltaTime;
@@ -181,6 +181,10 @@ struct PulseGenerator {
 		return false;
 	}
 
+	bool isHigh() {
+		return (remaining > 0.f);
+	}
+
 	/** Begins a trigger with the given `duration`. */
 	void trigger(float duration = 1e-3f) {
 		// Keep the previous pulse if the existing pulse will be held longer than the currently requested one.