diff --git a/sndlock.cpp b/sndlock.cpp
index 3be9baa..0e904cf 100644
--- a/sndlock.cpp
+++ b/sndlock.cpp
@@ -39,6 +39,7 @@ static float in_wave[HIST_DEPTH];
 
 static std::atomic<int> multiplier[SND_PCHAN];
 static std::atomic<double> lpf_bandwidth[SND_PCHAN];
+static std::atomic<std::complex<double>> ramc[SND_PCHAN];
 static std::atomic<double> principal_angle[SND_PCHAN];
 static std::atomic<double> li_principal[SND_PCHAN];
 
@@ -216,7 +217,7 @@ static void dsp_thread()
                 }
 
                 for(int j=0;j<SND_PCHAN;j++) {
-                    std::complex<double> lockin_out = lockin[j].update(sample);
+                    std::complex<double> lockin_out = lockin[j].update(sample) - (std::complex<double>)ramc[j];
                     double principal = std::real(lockin_out*std::polar(1.0, (double)principal_angle[j]));
 
                     li_principal[j] = principal;
@@ -360,6 +361,7 @@ int main(int argc, char* argv[])
         amplitude[i] = 1.0;
         multiplier[i] = 1;
         lpf_bandwidth[i] = 8.5;
+        ramc[i] = { 0.0, 0.0 };
         principal_angle[i] = M_PI/4.0;
         servo_state[i] = "DISABLED";
         init_current_cooling[i] = 310.0f;
@@ -395,6 +397,9 @@ int main(int argc, char* argv[])
     };
     std::atexit(SetShutdown);
 
+    bool ramc_enable[SND_PCHAN] = { false };
+    float ramc_mag[SND_PCHAN] = { 0.0f };
+    float ramc_phase[SND_PCHAN] = { 0.0f };
     int plot_sel[SND_PCHAN] = { 0 };
     while(!glfwWindowShouldClose(window)) {
         glfwPollEvents();
@@ -469,6 +474,33 @@ int main(int argc, char* argv[])
                 sprintf(str, "3f##%d", i);
                 ImGui::RadioButton(str, &multiplier_l, 3);
                 multiplier[i] = multiplier_l;
+
+                ImGui::SameLine();
+                ImGui::Text("| RAM cancellation:");
+                sprintf(str, "enable##ramc%d", i);
+                ImGui::SameLine();
+                ImGui::Checkbox(str, &ramc_enable[i]);
+                ImGui::PushItemWidth(ImGui::GetContentRegionAvail().x / 7.0f);
+                sprintf(str, "magnitude##ramc%d", i);
+                ImGui::SameLine();
+                ImGui::InputFloat(str, &ramc_mag[i], 0.001f, 0.01f, "%.4f");
+                sprintf(str, "phase##ramc%d", i);
+                ImGui::SameLine();
+                ImGui::InputFloat(str, &ramc_phase[i], 0.1f, 0.5f, "%.4f");
+                ImGui::PopItemWidth();
+                ImGui::SameLine();
+                sprintf(str, "baseline##ramc%d", i);
+                if(ImGui::Button(str)) {
+                    std::lock_guard<std::mutex> guard(li_hist_mutex);
+                    std::complex<float> new_ramc = std::polar(li_hist_mag[i][HIST_DEPTH-1], li_hist_phase[i][HIST_DEPTH-1]) + (std::complex<float>)ramc[i];
+                    ramc_mag[i] = std::abs(new_ramc);
+                    ramc_phase[i] = std::arg(new_ramc);
+                }
+                if(ramc_enable[i])
+                    ramc[i] = std::polar(ramc_mag[i], ramc_phase[i]);
+                else
+                    ramc[i] = { 0.0, 0.0 };
+
                 sprintf(str, "LPF BW##%d", i);
                 float lpf_bandwidth_l = lpf_bandwidth[i];
                 ImGui::SliderFloat(str, &lpf_bandwidth_l, 0.5f, 200.0f);