diff --git a/source/AYUGens/sc/AY.sc b/source/AYUGens/sc/AY.sc
index 93eb0f50a..c3eac8a03 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, sampleRate|
+		var chipTactsPerOutCount;
+		sampleRate = sampleRate ?? { Server.default.sampleRate };
+		// this mirrors ayemu's internal calculation of ChipTacts_per_outcount
+		chipTactsPerOutCount = 1773400.div(sampleRate).div(8);
+		^(sampleRate * chipTactsPerOutCount / (2 * freq)).round
 	}
 }
diff --git a/source/AYUGens/sc/HelpSource/Classes/AY.schelp b/source/AYUGens/sc/HelpSource/Classes/AY.schelp
index b922019e5..8a0dd07a5 100644
--- a/source/AYUGens/sc/HelpSource/Classes/AY.schelp
+++ b/source/AYUGens/sc/HelpSource/Classes/AY.schelp
@@ -99,6 +99,12 @@ general add controls for the resulting signal
 METHOD::freqtotone
 converts a frequency value to something appropriate for the strong::tonea::, strong::toneb:: and strong::tonec:: inputs.
 
+ARGUMENT::freq
+the frequency value in Hertz.
+
+ARGUMENT::sampleRate
+sample rate for the frequency conversion. default is strong::Server.default.sampleRate::.
+
 EXAMPLES::
 
 CODE::