diff --git a/src/Kyoto/Input/CRumbleVoice.cpp b/src/Kyoto/Input/CRumbleVoice.cpp
new file mode 100644
index 00000000..912c94e0
--- /dev/null
+++ b/src/Kyoto/Input/CRumbleVoice.cpp
@@ -0,0 +1,174 @@
+#include "Kyoto/Input/CRumbleVoice.hpp"
+#include "rstl/math.hpp"
+
+CRumbleVoice::CRumbleVoice()
+: x0_datas(4, SAdsrData())
+, x10_deltas(4, SAdsrDelta::Stopped())
+, x20_handleIds(0)
+, x2c_usedChannels(0)
+, x2e_lastId(0) {}
+
+s16 CRumbleVoice::Activate(const SAdsrData& data, u16 idx, float gain, ERumblePriority prio) {
+  if (gain > 0.f) {
+    x0_datas[idx] = data;
+    x10_deltas[idx] = SAdsrDelta::Start(prio, x2c_usedChannels == 0);
+    x10_deltas[idx].x14_attackIntensity = gain * x0_datas[idx].x0_attackGain;
+    x10_deltas[idx].x18_sustainIntensity = gain * x0_datas[idx].x10_sustainGain;
+    x2c_usedChannels |= 1 << idx;
+    if (data.x18_24_hasSustain)
+      return CreateRumbleHandle(idx);
+  }
+  return -1;
+}
+
+void CRumbleVoice::Deactivate(s16 id, bool b1) {
+  if (id == -1)
+    return;
+  if (OwnsSustained(id)) {
+    return;
+  } else if (x2c_usedChannels & (1 << (id & 0xf))) {
+    x10_deltas[(id & 0xf)].x20_phase = SAdsrDelta::kP_Release;
+    return;
+  }
+}
+
+void CRumbleVoice::HardReset() {
+  x2c_usedChannels = 0;
+  for (u16 i = 0; i < 4; ++i) {
+    x10_deltas[i] = SAdsrDelta::Stopped();
+    x20_handleIds[i] = 0;
+  }
+}
+
+bool CRumbleVoice::UpdateChannel(SAdsrDelta& delta, const SAdsrData& data, float dt) {
+  switch (delta.x20_phase) {
+  case SAdsrDelta::kP_PrePulse:
+    if (delta.x4_attackTime < (1.f / 30.f)) {
+      delta.x4_attackTime += dt;
+    } else {
+      delta.x20_phase = SAdsrDelta::kP_Attack;
+      delta.x0_curIntensity = 0.f;
+      delta.x4_attackTime = 0.f;
+    }
+    break;
+  case SAdsrDelta::kP_Attack:
+    if (delta.x4_attackTime < data.x8_attackDur) {
+      float t = delta.x4_attackTime / data.x8_attackDur;
+      delta.x0_curIntensity = ((1.f - t) * 0.f + delta.x14_attackIntensity) * t;
+      delta.x4_attackTime += dt;
+    } else {
+      delta.x0_curIntensity = delta.x14_attackIntensity;
+      delta.x20_phase = SAdsrDelta::kP_Decay;
+    }
+    break;
+  case SAdsrDelta::kP_Decay:
+    if (data.x18_24_hasSustain) {
+      if (delta.x8_decayTime > data.xc_decayDur) {
+        delta.x0_curIntensity = delta.x18_sustainIntensity;
+        delta.x20_phase = SAdsrDelta::kP_Sustain;
+      } else {
+        float t = delta.x8_decayTime / data.xc_decayDur;
+        delta.x0_curIntensity =
+            (1.f - t) * delta.x14_attackIntensity + t * delta.x18_sustainIntensity;
+        delta.x8_decayTime += dt;
+      }
+    } else {
+      if (delta.x8_decayTime < data.xc_decayDur) {
+        float t = delta.x8_decayTime / data.xc_decayDur;
+        delta.x0_curIntensity = delta.x14_attackIntensity * (1.f - t) + t * 0.f;
+        delta.x8_decayTime += dt;
+      } else {
+        delta.x0_curIntensity = 0.f;
+        delta.x20_phase = SAdsrDelta::kP_Stop;
+      }
+      if (delta.x20_phase != SAdsrDelta::kP_Decay) {
+        delta.x20_phase = SAdsrDelta::kP_Stop;
+        return true;
+      }
+    }
+    break;
+  case SAdsrDelta::kP_Release: {
+    float a = data.x18_24_hasSustain ? delta.x18_sustainIntensity : 0.f;
+    if (delta.xc_releaseTime < data.x14_releaseDur) {
+      float t = delta.xc_releaseTime / data.x14_releaseDur;
+      delta.x0_curIntensity = a * (1.f - t) + t * 0.f;
+      delta.xc_releaseTime += dt;
+    } else {
+      delta.x0_curIntensity = 0.f;
+      delta.x20_phase = SAdsrDelta::kP_Stop;
+    }
+    if (delta.x20_phase != SAdsrDelta::kP_Release) {
+      delta.x20_phase = SAdsrDelta::kP_Stop;
+      return true;
+    }
+  } break;
+  default:
+    break;
+  }
+
+  if (data.x18_25_autoRelease) {
+    if (delta.x10_autoReleaseTime < data.x4_autoReleaseDur)
+      delta.x10_autoReleaseTime += dt;
+    else if (delta.x20_phase == SAdsrDelta::kP_Sustain)
+      delta.x20_phase = SAdsrDelta::kP_Release;
+  }
+
+  return false;
+}
+bool CRumbleVoice::Update(float dt) {
+  if (x2c_usedChannels != 0) {
+    for (u16 i = 0; i < 4; ++i) {
+      if (x2c_usedChannels & (1 << i)) {
+        if (UpdateChannel(x10_deltas[i], x0_datas[i], dt)) {
+          x2c_usedChannels &= ~(1 << i);
+          x10_deltas[i] = SAdsrDelta::Stopped();
+        }
+      }
+    }
+    return true;
+  }
+  return false;
+}
+
+uint CRumbleVoice::GetFreeChannel() const {
+  for (u16 i = 0; i < 4; ++i) {
+    if ((x2c_usedChannels & (1 << i)) == 0) {
+      return i;
+    }
+  }
+  return 0;
+}
+float CRumbleVoice::GetIntensity() const {
+  float ret = x10_deltas[0].x0_curIntensity;
+  if (ret < x10_deltas[1].x0_curIntensity) {
+    ret = x10_deltas[1].x0_curIntensity;
+  }
+
+  if (ret < x10_deltas[2].x0_curIntensity) {
+    ret = x10_deltas[2].x0_curIntensity;
+  }
+
+  if (ret < x10_deltas[3].x0_curIntensity) {
+    ret = x10_deltas[3].x0_curIntensity;
+  }
+
+  if (ret > 2.f) {
+    return 2.f;
+  }
+
+  return ret;
+}
+bool CRumbleVoice::OwnsSustained(s16 handle) const {
+  u16 idx = (((u16)handle >> 8) & 0xff);
+  if (idx < 4)
+    return x20_handleIds[idx] == (idx & 0xf);
+  return false;
+}
+
+s16 CRumbleVoice::CreateRumbleHandle(u16 idx) {
+  ++x2e_lastId;
+  if (x2e_lastId == 0)
+    x2e_lastId = 1;
+  x20_handleIds[idx] = x2e_lastId;
+  return ((x2e_lastId << 8) | idx) & 0xFFFF;
+}