diff --git a/src/net/torvald/terrarum/audio/dsp/Convolv.kt b/src/net/torvald/terrarum/audio/dsp/Convolv.kt
index 079dc6a5c..a4f8f041b 100644
--- a/src/net/torvald/terrarum/audio/dsp/Convolv.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Convolv.kt
@@ -14,7 +14,6 @@ import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.COL_METER_GRAD_YEL
 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
-import java.io.File
 import kotlin.math.roundToInt
 
 /**
@@ -63,7 +62,7 @@ class Convolv(irModule: String, irPath: String, val crossfeed: Float, gain: Floa
 
 
 
-        pushSum(gain, inbuf[0], inbuf[1], sumbuf)
+        pushSumCircular(gain, inbuf[0], inbuf[1], sumbuf)
 
         convolve(sumbuf[0], convFFT[0], fftOutL)
         convolve(sumbuf[1], convFFT[1], fftOutR)
@@ -80,30 +79,16 @@ class Convolv(irModule: String, irPath: String, val crossfeed: Float, gain: Floa
         processingSpeed = realtime / ptime
     }
 
-
-    private fun push(gain: Float, samples: FloatArray, buf: ComplexArray) {
-        // shift numbers
-        System.arraycopy(buf.reim, samples.size * 2, buf.reim, 0, buf.reim.size - samples.size * 2)
-        // fill in the shifted area
-        val baseI = buf.reim.size - samples.size * 2
-        samples.forEachIndexed { index, fl ->
-            buf.reim[baseI + index * 2 + 0] = fl * gain
-            buf.reim[baseI + index * 2 + 1] = 0f
-        }
-    }
-
-    private fun pushSum(gain: Float, sampleL: FloatArray, sampleR: FloatArray, sumbuf: Array<ComplexArray>) {
-        // shift numbers
-        System.arraycopy(sumbuf[0].reim, sampleL.size * 2, sumbuf[0].reim, 0, sumbuf[0].reim.size - sampleL.size * 2)
-        System.arraycopy(sumbuf[1].reim, sampleL.size * 2, sumbuf[1].reim, 0, sumbuf[1].reim.size - sampleL.size * 2)
-        // fill in the shifted area
-        val baseI = sumbuf[0].reim.size - sampleL.size * 2
-        for (index in sampleL.indices) {
-            sumbuf[0].reim[baseI + index * 2 + 0] = (sampleL[index] * 1.000000f + sampleR[index] * crossfeed) * gain
-            sumbuf[0].reim[baseI + index * 2 + 1] = 0f
-            sumbuf[1].reim[baseI + index * 2 + 0] = (sampleL[index] * crossfeed + sampleR[index] * 1.000000f) * gain
-            sumbuf[1].reim[baseI + index * 2 + 1] = 0f
+    private var bufferIndex = 0
+    private fun pushSumCircular(gain: Float, sampleL: FloatArray, sampleR: FloatArray, sumbuf: Array<ComplexArray>) {
+        val baseIdx = bufferIndex * 2
+        for (i in sampleL.indices) {
+            sumbuf[0].reim[baseIdx + i * 2] = (sampleL[i] + sampleR[i] * crossfeed) * gain
+            sumbuf[0].reim[baseIdx + i * 2 + 1] = 0f
+            sumbuf[1].reim[baseIdx + i * 2] = (sampleL[i] * crossfeed + sampleR[i]) * gain
+            sumbuf[1].reim[baseIdx + i * 2 + 1] = 0f
         }
+        bufferIndex = (bufferIndex + sampleL.size) % (fftLen - sampleL.size)
     }
 
     override fun drawDebugView(batch: SpriteBatch, x: Int, y: Int) {