diff --git a/src/lib/assets/keymaps/chara-chorder.yml b/src/lib/assets/keymaps/chara-chorder.yml
index ab5688cb..225304db 100644
--- a/src/lib/assets/keymaps/chara-chorder.yml
+++ b/src/lib/assets/keymaps/chara-chorder.yml
@@ -104,6 +104,26 @@ actions:
     <<: *tertiary_keymap
     id: "KM_3_R"
     variant: right
+  558:
+    id: HOLD_COMPOUND
+    title: Activate Chord Library
+    icon: layers
+    description: |
+      When used in a chord includes that chord as a base 
+      compound chord for all subsequent chords.
+      This is effectively a library switch.
+      Since library activations can be nested, you
+      usually add a "Reset Chord Library" before this action.
+  559:
+    id: RELEASE_COMPOUND
+    title: Reset Chord Library
+    icon: layers_clear
+    description: |
+      Releases the active compound state, returning
+      to the default library.
+      While "Activate Chord Library" can only be used
+      as an output of a chord, this action can be assigned
+      to switches directly.
   576:
     id: ACTION_DELAY_1000
     icon: clock_loader_90
diff --git a/src/lib/serial/chord.ts b/src/lib/serial/chord.ts
index 959be4e3..4d52aad1 100644
--- a/src/lib/serial/chord.ts
+++ b/src/lib/serial/chord.ts
@@ -55,3 +55,19 @@ export function deserializeActions(native: bigint): number[] {
 
   return actions;
 }
+
+/**
+ * Hashes a chord input the same way as CCOS
+ */
+export function hashChord(actions: number[]) {
+  const chord = new Uint8Array(16);
+  const view = new DataView(chord.buffer);
+  const serialized = serializeActions(actions);
+  view.setBigUint64(0, serialized & 0xffff_ffff_ffff_ffffn, true);
+  view.setBigUint64(8, serialized >> 64n, true);
+  let hash = 2166136261;
+  for (let i = 0; i < 16; i++) {
+    hash = Math.imul(hash ^ view.getUint8(i), 16777619);
+  }
+  return hash & 0x3fff_ffff;
+}
diff --git a/src/lib/undo-redo.ts b/src/lib/undo-redo.ts
index 413131df..f0a51f48 100644
--- a/src/lib/undo-redo.ts
+++ b/src/lib/undo-redo.ts
@@ -1,6 +1,6 @@
 import { persistentWritable } from "$lib/storage";
 import { derived } from "svelte/store";
-import type { Chord } from "$lib/serial/chord";
+import { hashChord, type Chord } from "$lib/serial/chord";
 import {
   deviceChords,
   deviceLayout,
@@ -158,3 +158,9 @@ export const chords = derived([overlay, deviceChords], ([overlay, chords]) => {
     a.localeCompare(b),
   );
 });
+
+export const chordHashes = derived(
+  chords,
+  (chords) =>
+    new Map(chords.map((chord) => [hashChord(chord.actions), chord] as const)),
+);
diff --git a/src/routes/(app)/config/chords/+page.svelte b/src/routes/(app)/config/chords/+page.svelte
index ee5be783..dbef7749 100644
--- a/src/routes/(app)/config/chords/+page.svelte
+++ b/src/routes/(app)/config/chords/+page.svelte
@@ -144,7 +144,6 @@
       progress = i;
 
       if ("phrase" in chord) {
-        console.log(encodeChord(chord, osLayout));
         await index.addAsync(i, encodeChord(chord, osLayout));
       }
     }
diff --git a/src/routes/(app)/config/chords/ChordActionEdit.svelte b/src/routes/(app)/config/chords/ChordActionEdit.svelte
index beffaaca..052271c9 100644
--- a/src/routes/(app)/config/chords/ChordActionEdit.svelte
+++ b/src/routes/(app)/config/chords/ChordActionEdit.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
   import type { ChordInfo } from "$lib/undo-redo";
-  import { changes, ChangeType } from "$lib/undo-redo";
+  import { changes, chordHashes, ChangeType } from "$lib/undo-redo";
   import { createEventDispatcher } from "svelte";
   import LL from "$i18n/i18n-svelte";
   import ActionString from "$lib/components/ActionString.svelte";
@@ -8,6 +8,7 @@
   import { serialPort } from "$lib/serial/connection";
   import { get } from "svelte/store";
   import { inputToAction } from "./input-converter";
+  import { hashChord } from "$lib/serial/chord";
 
   export let chord: ChordInfo | undefined = undefined;
 
@@ -21,14 +22,15 @@
   }
 
   function makeChordInput(...actions: number[]) {
-    const compound = compoundIndices ?? [];
+    const compound = compoundInputs[0]
+      ? hashChord(compoundInputs[0].actions)
+      : 0;
     return [
-      ...compound,
       ...Array.from(
         {
-          length: 12 - (compound.length + actions.length + 1),
+          length: 12 - actions.length,
         },
-        () => 0,
+        (_, i) => (compound >> (i * 10)) & 0x3ff,
       ),
       ...actions.toSorted(compare),
     ];
@@ -73,7 +75,6 @@
   function addSpecial(event: MouseEvent) {
     selectAction(event, (action) => {
       changes.update((changes) => {
-        console.log(compoundIndices, chordActions, action);
         changes.push({
           type: ChangeType.Chord,
           id: chord!.id,
@@ -85,10 +86,30 @@
     });
   }
 
+  function* resolveCompound(chord?: ChordInfo) {
+    if (!chord) return;
+    let current = chord;
+    for (let i = 0; i < 10; i++) {
+      if (current.actions[3] !== 0) return;
+      const compound = current.actions
+        .slice(0, 3)
+        .reduce((a, b, i) => a | (b << (i * 10)));
+      if (compound === 0) return;
+      const next = $chordHashes.get(compound);
+      if (!next) {
+        return null;
+      }
+
+      current = next;
+      yield next;
+    }
+    return;
+  }
+
   $: chordActions = chord?.actions
     .slice(chord.actions.lastIndexOf(0) + 1)
     .toSorted(compare);
-  $: compoundIndices = chord?.actions.slice(0, chord.actions.indexOf(0));
+  $: compoundInputs = [...resolveCompound(chord)];
 </script>
 
 <button
@@ -110,12 +131,15 @@
     <span>{$LL.configure.chords.NEW_CHORD()}</span>
   {/if}
   {#if !editing}
-    {#each compoundIndices ?? [] as index}
-      <sub>{index}</sub>
-    {/each}
-    {#if compoundIndices?.length}
+    {#each compoundInputs as compound}
+      <sub
+        ><ActionString
+          display="keys"
+          actions={compound.actions.slice(compound.actions.lastIndexOf(0) + 1)}
+        ></ActionString>
+      </sub>
       <span>&rarr;</span>
-    {/if}
+    {/each}
   {/if}
   <ActionString
     display="keys"
diff --git a/src/routes/(app)/plugin/+page.svelte b/src/routes/(app)/plugin/+page.svelte
index a8e07360..7b0d8e02 100644
--- a/src/routes/(app)/plugin/+page.svelte
+++ b/src/routes/(app)/plugin/+page.svelte
@@ -137,9 +137,6 @@
         if (parent) {
         }
       }
-      console.log(nodeBefore);
-
-      console.log(context);
       return null;
     },
   });