diff --git a/gumble/gumble/integration_audio_test.go b/gumble/gumble/integration_audio_test.go
index bc24a55..c17e90c 100644
--- a/gumble/gumble/integration_audio_test.go
+++ b/gumble/gumble/integration_audio_test.go
@@ -27,13 +27,23 @@ func (l *integrationAudioListener) OnAudioStream(e *gumble.AudioStreamEvent) {
 
 // TestLocalMumbleAudioRoundTrip sends generated 440 Hz audio through a real
 // local Mumble server and requires the other client to decode non-silent PCM.
-func TestLocalMumbleAudioRoundTrip(t *testing.T) { testLocalMumbleAudioRoundTrip(t, false) }
+func TestLocalMumbleAudioRoundTrip(t *testing.T) {
+	testLocalMumbleAudioRoundTrip(t, false, gumble.AudioDefaultInterval)
+}
+
+// Regression: non-default permitted intervals must preserve generated audio
+// instead of using the old fixed-10ms bitrate calculation.
+func TestLocalMumbleAudioTwentyMilliseconds(t *testing.T) {
+	testLocalMumbleAudioRoundTrip(t, false, 20*time.Millisecond)
+}
 
 // Regression: TCP tunnel fallback must remain usable when UDP is deliberately
 // disabled or blocked, rather than silently dropping valid audio.
-func TestLocalMumbleTCPAudioFallback(t *testing.T) { testLocalMumbleAudioRoundTrip(t, true) }
+func TestLocalMumbleTCPAudioFallback(t *testing.T) {
+	testLocalMumbleAudioRoundTrip(t, true, gumble.AudioDefaultInterval)
+}
 
-func testLocalMumbleAudioRoundTrip(t *testing.T, disableUDP bool) {
+func testLocalMumbleAudioRoundTrip(t *testing.T, disableUDP bool, interval time.Duration) {
 	if os.Getenv("BARNARD_MUMBLE_INTEGRATION") != "1" {
 		t.Skip("set BARNARD_MUMBLE_INTEGRATION=1")
 	}
@@ -42,6 +52,7 @@ func testLocalMumbleAudioRoundTrip(t *testing.T, disableUDP bool) {
 		c.Address = "localhost:64738"
 		c.Username = name
 		c.DisableUDP = disableUDP
+		c.AudioInterval = interval
 		return c
 	}
 	tlsConfig := &tls.Config{InsecureSkipVerify: true}