diff --git a/src/net/torvald/terrarum/audio/MixerTrackProcessor.kt b/src/net/torvald/terrarum/audio/MixerTrackProcessor.kt
index f62aafa7c..da3528c5a 100644
--- a/src/net/torvald/terrarum/audio/MixerTrackProcessor.kt
+++ b/src/net/torvald/terrarum/audio/MixerTrackProcessor.kt
@@ -144,7 +144,8 @@ class MixerTrackProcessor(bufferSize: Int, val rate: Int, val track: TerrarumAud
                         )
                         val isApproaching = if (distFromActorNext <= distFromActor) 1.0 else -1.0
                         val relativeSpeed = (sourceVec - listenerVec).magnitude * GAME_TO_SI_VELO * isApproaching
-                        val dopplerFactor = (SPEED_OF_SOUND_AIR + relativeSpeed) / SPEED_OF_SOUND_AIR // >1: speedup, <1: speeddown
+                        val soundSpeed = SPEED_OF_SOUND_AIR * 4f // using an arbitrary value for "gamification"
+                        val dopplerFactor = (soundSpeed + relativeSpeed) / soundSpeed // >1: speedup, <1: speeddown
 
                         track.processor.streamBuf?.playbackSpeed = dopplerFactor.toFloat()
 
diff --git a/src/net/torvald/terrarum/audio/dsp/BinoPan.kt b/src/net/torvald/terrarum/audio/dsp/BinoPan.kt
index 9167c08d0..2a0971db9 100644
--- a/src/net/torvald/terrarum/audio/dsp/BinoPan.kt
+++ b/src/net/torvald/terrarum/audio/dsp/BinoPan.kt
@@ -22,6 +22,8 @@ import kotlin.math.tanh
  * @param pan -1 for far-left, 0 for centre, 1 for far-right
  * @param soundSpeed speed of the sound in meters per seconds
  * @param earDist distance between ears in meters. Maximum: 16.0
+ *
+ * Created by minjaesong on 2023-11-23.
  */
 class BinoPan(var pan: Float, var earDist: Float = EARDIST_DEFAULT): TerrarumAudioFilter() {
 
diff --git a/src/net/torvald/terrarum/audio/dsp/Bitcrush.kt b/src/net/torvald/terrarum/audio/dsp/Bitcrush.kt
index 76be14a0e..a7d1a9f92 100644
--- a/src/net/torvald/terrarum/audio/dsp/Bitcrush.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Bitcrush.kt
@@ -9,6 +9,9 @@ import net.torvald.terrarum.ui.BasicDebugInfoWindow
 import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.toIntAndFrac
 import net.torvald.terrarum.ui.Toolkit
 
+/**
+ * Created by minjaesong on 2023-11-23.
+ */
 class Bitcrush(var steps: Int, var inputGain: Float = 1f): TerrarumAudioFilter() {
     override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
         for (ch in outbuf.indices) {
diff --git a/src/net/torvald/terrarum/audio/dsp/Buffer.kt b/src/net/torvald/terrarum/audio/dsp/Buffer.kt
index 2cc7c804b..8f5912b6b 100644
--- a/src/net/torvald/terrarum/audio/dsp/Buffer.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Buffer.kt
@@ -4,6 +4,9 @@ import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import net.torvald.terrarum.App
 import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.FILTER_NAME_ACTIVE
 
+/**
+ * Created by minjaesong on 2023-11-18.
+ */
 object Buffer : TerrarumAudioFilter() {
     init {
         bypass = true
diff --git a/src/net/torvald/terrarum/audio/dsp/Convolv.kt b/src/net/torvald/terrarum/audio/dsp/Convolv.kt
index 53cdeccab..cc46dee2b 100644
--- a/src/net/torvald/terrarum/audio/dsp/Convolv.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Convolv.kt
@@ -21,6 +21,8 @@ import kotlin.math.roundToInt
  * @param ir Binary file containing MONO IR (containing only two channels)
  * @param crossfeed The amount of channel crossfeeding to simulate the true stereo IR. Fullscale (0.0 - 1.0)
  * @param gain output gain. Fullscale (0.0 - 1.0)
+ *
+ * Created by minjaesong on 2023-11-25.
  */
 class Convolv(ir: File, val crossfeed: Float, gain: Float = 1f / 256f): TerrarumAudioFilter() {
 
diff --git a/src/net/torvald/terrarum/audio/dsp/Gain.kt b/src/net/torvald/terrarum/audio/dsp/Gain.kt
index 8d8e2d31a..1dc659506 100644
--- a/src/net/torvald/terrarum/audio/dsp/Gain.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Gain.kt
@@ -6,6 +6,9 @@ import net.torvald.terrarum.audio.fullscaleToDecibels
 import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.FILTER_NAME_ACTIVE
 import kotlin.math.roundToInt
 
+/**
+ * Created by minjaesong on 2023-11-25.
+ */
 class Gain(var gain: Float): TerrarumAudioFilter() {
     override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
         for (i in 0 until App.audioBufferSize) {
diff --git a/src/net/torvald/terrarum/audio/dsp/Highpass.kt b/src/net/torvald/terrarum/audio/dsp/Highpass.kt
index cf42e7ceb..83132c3f3 100644
--- a/src/net/torvald/terrarum/audio/dsp/Highpass.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Highpass.kt
@@ -10,7 +10,9 @@ import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.COL_METER_GRAD2
 import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.FILTER_NAME_ACTIVE
 import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.STRIP_W
 import net.torvald.terrarum.ui.Toolkit
-
+/**
+ * Created by minjaesong on 2023-11-19.
+ */
 class Highpass(cutoff0: Float): TerrarumAudioFilter() {
 
     var cutoff = cutoff0.toDouble(); private set
diff --git a/src/net/torvald/terrarum/audio/dsp/LoFi.kt b/src/net/torvald/terrarum/audio/dsp/LoFi.kt
new file mode 100644
index 000000000..e63425db8
--- /dev/null
+++ b/src/net/torvald/terrarum/audio/dsp/LoFi.kt
@@ -0,0 +1,53 @@
+package net.torvald.terrarum.audio.dsp
+
+import com.badlogic.gdx.graphics.g2d.SpriteBatch
+import net.torvald.terrarum.App
+import java.io.File
+import kotlin.math.absoluteValue
+import kotlin.math.tanh
+
+/**
+ * Convolver with tanh saturator
+ *
+ * @param ir Binary file containing MONO IR (containing only two channels)
+ * @param crossfeed The amount of channel crossfeeding to simulate the true stereo IR. Fullscale (0.0 - 1.0)
+ * @param gain output gain. Fullscale (0.0 - 1.0)
+ *
+ * Created by minjaesong on 2024-01-21.
+ */
+class LoFi(ir: File, val crossfeed: Float, gain: Float = 1f / 256f): TerrarumAudioFilter(), DspCompressor {
+    override val downForce = arrayOf(1.0f, 1.0f)
+
+    internal val convolver = Convolv(ir, crossfeed, gain)
+
+    private val imm = listOf(FloatArray(App.audioBufferSize), FloatArray(App.audioBufferSize))
+
+    override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
+        convolver.thru(inbuf, imm)
+
+        for (ch in imm.indices) {
+            val inn = imm[ch]
+            val out = outbuf[ch]
+
+            for (i in inn.indices) {
+                val u = inn[i]
+                val v = tanh(u)
+                val diff = (v.absoluteValue / u.absoluteValue)
+                out[i] = v
+
+                if (!diff.isNaN()) {
+                    downForce[ch] = minOf(downForce[ch], diff)
+                }
+            }
+        }
+    }
+
+    override fun drawDebugView(batch: SpriteBatch, x: Int, y: Int) {
+    }
+
+    override val debugViewHeight = 0
+
+    override fun copyParamsFrom(other: TerrarumAudioFilter) {
+        this.convolver.copyParamsFrom((other as LoFi).convolver)
+    }
+}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/audio/dsp/Lowpass.kt b/src/net/torvald/terrarum/audio/dsp/Lowpass.kt
index 473fb4601..990448390 100644
--- a/src/net/torvald/terrarum/audio/dsp/Lowpass.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Lowpass.kt
@@ -11,6 +11,9 @@ import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.COL_METER_GRAD2
 import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.FILTER_NAME_ACTIVE
 import net.torvald.terrarum.ui.Toolkit
 
+/**
+ * Created by minjaesong on 2023-11-17.
+ */
 class Lowpass(cutoff0: Float): TerrarumAudioFilter() {
 
     var cutoff = cutoff0.toDouble(); private set
diff --git a/src/net/torvald/terrarum/audio/dsp/NullFilter.kt b/src/net/torvald/terrarum/audio/dsp/NullFilter.kt
index 4c38b52ef..6a2027f4c 100644
--- a/src/net/torvald/terrarum/audio/dsp/NullFilter.kt
+++ b/src/net/torvald/terrarum/audio/dsp/NullFilter.kt
@@ -2,6 +2,9 @@ package net.torvald.terrarum.audio.dsp
 
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 
+/**
+ * Created by minjaesong on 2023-11-17.
+ */
 object NullFilter : TerrarumAudioFilter() {
     override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
         outbuf.forEachIndexed { index, outTrack ->
diff --git a/src/net/torvald/terrarum/audio/dsp/Reverb.kt b/src/net/torvald/terrarum/audio/dsp/Reverb.kt
index 4a8d483d9..a44a2672f 100644
--- a/src/net/torvald/terrarum/audio/dsp/Reverb.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Reverb.kt
@@ -6,6 +6,9 @@ import net.torvald.terrarum.App
 import net.torvald.terrarum.audio.TerrarumAudioMixerTrack
 import kotlin.math.roundToInt
 
+/**
+ * Created by minjaesong on 2023-11-23.
+ */
 class Reverb(val delayMS: Float = 36f, var feedback: Float = 0.92f, var lowpass: Float = 1200f): TerrarumAudioFilter() {
 
     private val highpass = 80f
diff --git a/src/net/torvald/terrarum/audio/dsp/SoftClp.kt b/src/net/torvald/terrarum/audio/dsp/SoftClp.kt
index bf567944e..2676d5ac6 100644
--- a/src/net/torvald/terrarum/audio/dsp/SoftClp.kt
+++ b/src/net/torvald/terrarum/audio/dsp/SoftClp.kt
@@ -5,8 +5,11 @@ import kotlin.math.absoluteValue
 import kotlin.math.pow
 import kotlin.math.sqrt
 
-object SoftClp : TerrarumAudioFilter() {
-    val downForce = arrayOf(1.0f, 1.0f)
+/**
+ * Created by minjaesong on 2023-11-20.
+ */
+object SoftClp : TerrarumAudioFilter(), DspCompressor {
+    override val downForce = arrayOf(1.0f, 1.0f)
 
     override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
         downForce.fill(1.0f)
diff --git a/src/net/torvald/terrarum/audio/dsp/Spectro.kt b/src/net/torvald/terrarum/audio/dsp/Spectro.kt
index 1c54497b1..794e6c20b 100644
--- a/src/net/torvald/terrarum/audio/dsp/Spectro.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Spectro.kt
@@ -11,6 +11,9 @@ import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.STRIP_W
 import net.torvald.terrarum.ui.Toolkit
 import kotlin.math.*
 
+/**
+ * Created by minjaesong on 2023-12-21.
+ */
 class Spectro(var gain: Float = 1f) : TerrarumAudioFilter() {
     private val FFTSIZE = 1024
     private val inBuf = Array(2) { FloatArray(FFTSIZE) }
@@ -99,7 +102,9 @@ class Spectro(var gain: Float = 1f) : TerrarumAudioFilter() {
     }
 }
 
-
+/**
+ * Created by minjaesong on 2023-11-20.
+ */
 class Vecto(var gain: Float = 1f) : TerrarumAudioFilter() {
     var backbufL = Array((6144f / App.audioBufferSize).roundToInt().coerceAtLeast(1)) {
         FloatArray(App.audioBufferSize)
diff --git a/src/net/torvald/terrarum/audio/dsp/TerrarumAudioFilter.kt b/src/net/torvald/terrarum/audio/dsp/TerrarumAudioFilter.kt
index 878a35087..0c0eb215a 100644
--- a/src/net/torvald/terrarum/audio/dsp/TerrarumAudioFilter.kt
+++ b/src/net/torvald/terrarum/audio/dsp/TerrarumAudioFilter.kt
@@ -2,9 +2,12 @@ package net.torvald.terrarum.audio.dsp
 
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 
+/**
+ * Created by minjaesong on 2023-11-17.
+ */
 abstract class TerrarumAudioFilter {
     var bypass = false
-    protected abstract fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>)
+    abstract fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>)
     operator fun invoke(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
         if (bypass) {
             outbuf.forEachIndexed { index, outTrack ->
@@ -18,6 +21,13 @@ abstract class TerrarumAudioFilter {
     abstract fun copyParamsFrom(other: TerrarumAudioFilter)
 }
 
+/**
+ * Created by minjaesong on 2024-01-21.
+ */
+interface DspCompressor {
+    val downForce: Array<Float>
+}
+
 fun FloatArray.applyGain(gain: Float = 1f) = this.map { it * gain }.toFloatArray()
 fun push(samples: FloatArray, buf: FloatArray) {
     if (samples.size >= buf.size) {
diff --git a/src/net/torvald/terrarum/audio/dsp/XYtoMS.kt b/src/net/torvald/terrarum/audio/dsp/XYtoMS.kt
index 466780ba8..32a1eb5b9 100644
--- a/src/net/torvald/terrarum/audio/dsp/XYtoMS.kt
+++ b/src/net/torvald/terrarum/audio/dsp/XYtoMS.kt
@@ -3,6 +3,9 @@ package net.torvald.terrarum.audio.dsp
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import net.torvald.terrarum.App
 
+/**
+ * Created by minjaesong on 2023-11-24.
+ */
 object XYtoMS: TerrarumAudioFilter() {
     override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
         for (i in 0 until App.audioBufferSize) {
@@ -24,6 +27,9 @@ object XYtoMS: TerrarumAudioFilter() {
     }
 }
 
+/**
+ * Created by minjaesong on 2023-11-24.
+ */
 object MStoXY: TerrarumAudioFilter() {
     override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
         for (i in 0 until App.audioBufferSize) {
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureJukebox.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureJukebox.kt
index 5d59ac7c9..f9459897d 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureJukebox.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureJukebox.kt
@@ -11,6 +11,7 @@ import net.torvald.terrarum.App.printdbg
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
 import net.torvald.terrarum.audio.AudioMixer.Companion.DEFAULT_FADEOUT_LEN
 import net.torvald.terrarum.audio.dsp.Convolv
+import net.torvald.terrarum.audio.dsp.LoFi
 import net.torvald.terrarum.audio.dsp.NullFilter
 import net.torvald.terrarum.gameactors.AVKey
 import net.torvald.terrarum.gameitems.ItemID
@@ -40,6 +41,8 @@ class FixtureJukebox : Electric {
 
     @Transient private val backLamp: SheetSpriteAnimation
 
+    @Transient private val filterIndex = 2
+
     internal val discInventory = ArrayList<ItemID>()
 
     val musicIsPlaying: Boolean
@@ -114,7 +117,7 @@ class FixtureJukebox : Electric {
 
             App.audioMixer.requestFadeOut(App.audioMixer.musicTrack, DEFAULT_FADEOUT_LEN / 2f) {
                 startAudio(musicNowPlaying!!) {
-                    it.filters[2] = Convolv(
+                    it.filters[filterIndex] = LoFi(
                         ModMgr.getFile(
                             "basegame",
                             "audio/convolution/Soundwoofer - large_speaker_Marshall JVM 205C SM57 A 0 0 1.bin"
@@ -162,7 +165,7 @@ class FixtureJukebox : Electric {
     private fun unloadConvolver(music: MusicContainer?) {
         if (music != null) {
             musicTracks[music]?.let {
-                it.filters[2] = NullFilter
+                it.filters[filterIndex] = NullFilter
             }
         }
     }
diff --git a/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt b/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
index 9177f58b5..6106a6c6b 100644
--- a/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
+++ b/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
@@ -721,7 +721,7 @@ class BasicDebugInfoWindow : UICanvas() {
         }
 
         // comp marker
-        track.filters.filterIsInstance<SoftClp>().firstOrNull()?.let {
+        track.filters.filterIsInstance<DspCompressor>().firstOrNull()?.let {
             for (ch in 0..1) {
                 val downForceNow = it.downForce[ch] * 1.0
                 if (downForceNow != 0.0) {