diff --git a/src/net/torvald/terrarum/audio/FFT.kt b/src/net/torvald/terrarum/audio/FFT.kt
index 5164b2259..2af97f56e 100644
--- a/src/net/torvald/terrarum/audio/FFT.kt
+++ b/src/net/torvald/terrarum/audio/FFT.kt
@@ -96,20 +96,11 @@ object FFT: Disposable {
         return ComplexArray(signal)
     }
 
-    fun fft(signal0: ComplexArray) {
-        ffts[signal0.size]!!.complexForward(signal0.reim)
-    }
-
     fun fftInto(signal0: ComplexArray, out: ComplexArray) {
         System.arraycopy(signal0.reim, 0, out.reim, 0, signal0.reim.size)
         ffts[signal0.size]!!.complexForward(out.reim)
     }
 
-    fun ifftAndGetReal(signal0: ComplexArray): FloatArray {
-        ffts[signal0.size]!!.complexInverse(signal0.reim, true)
-        return signal0.getReal()
-    }
-
     fun ifftAndGetReal(signal0: ComplexArray, output: FloatArray) {
         ffts[signal0.size]!!.complexInverse(signal0.reim, true)
         for (i in 0 until signal0.size) {
diff --git a/src/net/torvald/terrarum/audio/dsp/Convolv.kt b/src/net/torvald/terrarum/audio/dsp/Convolv.kt
index 396097bcd..2b23af353 100644
--- a/src/net/torvald/terrarum/audio/dsp/Convolv.kt
+++ b/src/net/torvald/terrarum/audio/dsp/Convolv.kt
@@ -93,18 +93,6 @@ class Convolv(irModule: String, irPath: String, val crossfeed: Float, gain: Floa
         }
     }
 
-    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) {
     // processing speed bar
         val w = processingSpeed