diff --git a/app/src/main/kotlin/net/jeena/pacer/AudioEngine.kt b/app/src/main/kotlin/net/jeena/pacer/AudioEngine.kt
index 58f7b9e..fefc153 100644
--- a/app/src/main/kotlin/net/jeena/pacer/AudioEngine.kt
+++ b/app/src/main/kotlin/net/jeena/pacer/AudioEngine.kt
@@ -1,6 +1,7 @@
 package net.jeena.pacer
 
 import android.media.AudioAttributes
+import kotlin.math.pow
 import android.media.AudioFormat
 import android.media.AudioTrack
 import android.os.Handler
@@ -23,10 +24,16 @@ class AudioEngine {
         private const val BEEP_DURATION_MS = 40
         private const val SILENCE_CHUNK_MS = 10
 
-        // Apply a square curve so the slider feels linear to human hearing.
-        // AudioTrack.setVolume() takes a linear amplitude; our 0-1 slider
-        // value is perceived as "all the volume at the bottom" without this.
-        private fun toAmplitude(linear: Float): Float = linear * linear
+        // Map the linear 0-1 slider to a perceptually even loudness curve.
+        // AudioTrack.setVolume() takes a linear amplitude, but human hearing
+        // is logarithmic: equal dB steps sound like equal volume steps.
+        // We map the slider to a -40 dB … 0 dB range, so each 25% of travel
+        // changes perceived loudness by the same amount.
+        private fun toAmplitude(linear: Float): Float {
+            if (linear <= 0f) return 0f
+            val db = -40f * (1f - linear)   // 0.0 → -40 dB,  1.0 → 0 dB
+            return 10f.pow(db / 20f)
+        }
     }
 
     private val mainHandler = Handler(Looper.getMainLooper())