diff --git a/source/AYUGens/sc/AY.sc b/source/AYUGens/sc/AY.sc
index 93eb0f50a..31401ef00 100644
--- a/source/AYUGens/sc/AY.sc
+++ b/source/AYUGens/sc/AY.sc
@@ -16,9 +16,11 @@ AY : UGen {
 
 	*categories { ^ #["UGens>Oscillators"] }
 
-	*freqtotone { |freq|
-		// Approximate empirical...
-		//^(109300 / (freq - 3.70727))
-		^(110300 / (freq - 0.5))
+	*freqtotone { |freq, s=nil|
+		var chipTactsPerOutCount;
+		s = s ?? { Server.default };
+		// this mirrors ayemu's internal calculation of ChipTacts_per_outcount
+		chipTactsPerOutCount = 1773400.div(Server.default.sampleRate).div(8);
+		^(s.sampleRate * chipTactsPerOutCount / (2 * freq)).round
 	}
 }