diff --git a/boilerbloat/src/main/backend.ts b/boilerbloat/src/main/backend.ts
index dc458c0..5bd606f 100644
--- a/boilerbloat/src/main/backend.ts
+++ b/boilerbloat/src/main/backend.ts
@@ -3,7 +3,7 @@ import { ipcMain } from 'electron';
 import { blackout } from '../patterns/blackout';
 import { Pattern, PatternOutput, Time } from '../patterns/proto';
 import { TestPattern } from '../patterns/test';
-import rust, { BeatTrackerHandle, MovingHeadState, OutputHandle } from 'rust_native_module';
+import rust, { BeatTrackerHandle, MovingHeadState, OutputHandle, TrackerConfig } from 'rust_native_module';
 import { ChaserPattern } from '../patterns/chaser';
 
 export type AppState = {
@@ -15,6 +15,7 @@ export type AppState = {
     bassFiltered: Array<number>,
     autoCorrelated: Array<number>,
   } | null,
+  trackerConfig: TrackerConfig,
 };
 
 class Backend {
@@ -66,12 +67,27 @@ class Backend {
       selectedPattern: null,
       beatProgress: null,
       graphData: null,
+      trackerConfig: {
+        mode: "auto",
+        acThreshold: 1000,
+        zeroCrossingBeatDelay: 0,
+      }
     }
 
     ipcMain.on('pattern-select', async (_, arg) => {
       this.state.selectedPattern = arg;
     });
 
+    ipcMain.on('update-delay', async (_, delay) => {
+      this.state.trackerConfig.zeroCrossingBeatDelay = Math.floor(delay);
+      this.beatTracker.setConfig(this.state.trackerConfig);
+    });
+
+    ipcMain.on('manual-mode', async (_, is_manual) => {
+      this.state.trackerConfig.mode = is_manual ? "manual" : "auto";
+      this.beatTracker.setConfig(this.state.trackerConfig);
+    });
+
     let time: Time = {
       absolute: 0,
       beatRelative: this.state.beatProgress,
diff --git a/boilerbloat/src/renderer/App.tsx b/boilerbloat/src/renderer/App.tsx
index 28aa9f5..85b4545 100644
--- a/boilerbloat/src/renderer/App.tsx
+++ b/boilerbloat/src/renderer/App.tsx
@@ -7,6 +7,7 @@ import { useEffect, useState } from 'react';
 import { AppState } from '../main/backend';
 import PatternPreview from './PatternPreview';
 import GraphVisualization from './Graph';
+import ConfigControls from './ConfigControls';
 
 const ipcRenderer = (window as any).electron.ipcRenderer as IpcRenderer;
 
@@ -63,9 +64,7 @@ const Frontend: React.FC<{ state: AppState }> = ({ state }) => {
         </div>
         : <div> no graph data </div>
     }
-    <div>
-      {JSON.stringify(state)}
-    </div>
+    <ConfigControls/>
   </>;
 }
 
diff --git a/boilerbloat/src/renderer/ConfigControls.tsx b/boilerbloat/src/renderer/ConfigControls.tsx
new file mode 100644
index 0000000..3738432
--- /dev/null
+++ b/boilerbloat/src/renderer/ConfigControls.tsx
@@ -0,0 +1,27 @@
+import { useRef } from "react";
+
+import { IpcRenderer } from 'electron/renderer';
+const ipcRenderer = (window as any).electron.ipcRenderer as IpcRenderer;
+
+const ConfigControls: React.FC = () => {
+
+  const bruh = useRef<HTMLInputElement>(null);
+
+  return <>
+    <p>Delay:</p>
+    <input ref={bruh} type="number" min="-1000" max="1000" onChange={
+      (e) => {
+        ipcRenderer.send("update-delay", e.currentTarget.value)
+      }
+    } />
+    <p>Manual mode:
+    <input type="checkbox" onClick = {
+      (e) => {
+        ipcRenderer.send("manual-mode", e.currentTarget.checked);
+      }
+    }></input>
+    </p>
+  </>;
+}
+
+export default ConfigControls;
diff --git a/rust_native_module/src/beat_tracking/tracker.rs b/rust_native_module/src/beat_tracking/tracker.rs
index 265fd6a..96c07b7 100644
--- a/rust_native_module/src/beat_tracking/tracker.rs
+++ b/rust_native_module/src/beat_tracking/tracker.rs
@@ -188,11 +188,11 @@ impl BeatTracker {
                         let mut prev = now - Duration::from_millis(dt as u64);
 
                         let period_millis = (period_length * MILLIS_PER_POINT) as u64;
-                        
+
                         let period = Duration::from_millis(period_millis);
 
                         let mut next = prev + period;
-                       
+
                         if let Some((_, old_next)) = self.current_beats {
                             while next < old_next + Duration::from_millis(period_millis / 2) {
                                 prev += period;
@@ -209,12 +209,16 @@ impl BeatTracker {
 
                 let (prev, next) = self.current_beats.unwrap();
 
-                let fractional = if prev < now {
-                    (now - prev).as_millis() as f64 / (next - prev).as_millis() as f64
+                let mut relative_millis = if prev < now {
+                    (now - prev).as_millis() as f64
                 } else {
-                    -1.0 * (prev - now).as_millis() as f64 / (next - prev).as_millis() as f64
+                    -1.0 * (prev - now).as_millis() as f64
                 };
 
+                relative_millis += self.config.zero_crossing_beat_delay as f64;
+
+                let fractional = relative_millis / (next - prev).as_millis() as f64;
+
                 Some(self.beat_count as f64 + fractional)
             }