diff --git a/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt b/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
index 4025e3dde..b08101a1f 100644
--- a/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
+++ b/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
@@ -2,6 +2,7 @@ package net.torvald.terrarum.audio
 
 import com.jme3.math.FastMath
 import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.BUFFER_SIZE
+import net.torvald.terrarum.modulebasegame.ui.abs
 import kotlin.math.tanh
 
 abstract class TerrarumAudioFilter {
@@ -55,11 +56,11 @@ class Scope : TerrarumAudioFilter() {
 
         // plot dots
         for (i in 0 until BUFFER_SIZE/4) {
-            val x0 = inbuf1[0][i] * 0.7
-            val y0 = inbuf1[1][i] * 0.7
+            val y0 = inbuf1[0][i] * 0.7
+            val x0 = -inbuf1[1][i] * 0.7 // rotate the domain by -90 deg
 
-            val x = (x0*sqrt2p + y0*sqrt2p) * 1.414
-            val y = (x0*sqrt2p - y0*sqrt2p) * 1.414
+            val x = (+x0*sqrt2p -y0*sqrt2p) * 1.414
+            val y = (-x0*sqrt2p -y0*sqrt2p) * 1.414 // further rotate by -45 deg then flip along the y axis
 
             backbufL[0][i] = x.toFloat()
             backbufR[0][i] = y.toFloat()
diff --git a/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt b/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
index b130016bd..0267c6877 100644
--- a/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
+++ b/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
@@ -569,6 +569,9 @@ class BasicDebugInfoWindow : UICanvas() {
                 App.fontSmallNumbers.draw(batch, "Bs:${BUFFER_SIZE/4}", x+3f, y+1f)
             }
             is Scope -> {
+//                batch.color = COL_FILTER_WELL_BACK
+//                Toolkit.fillArea(batch, 200, 200, 256, 256)
+
                 batch.color = scopePlotCol
                 val xxs = filter.backbufR
                 val yys = filter.backbufL
@@ -586,6 +589,9 @@ class BasicDebugInfoWindow : UICanvas() {
                         val py = ys[i] * halfStripW + halfStripW
                         Toolkit.fillArea(batch, x + px, y + py, 1f, 1f)
 
+
+//                        Toolkit.fillArea(batch, 328 + xs[i] * 128, 328 + ys[i] * 128, 1f, 1f)
+
 //                        scopedSamples++
                     }