From f5ae50c3cee2dd4b53476518b2765d8c58ddcaa6 Mon Sep 17 00:00:00 2001
From: JoStro <joseph.strong@live.co.uk>
Date: Tue, 1 Jul 2025 22:02:54 +0100
Subject: [PATCH 1/4] Modify `extend` to better match behavior of `!` operator

---
 packages/core/pattern.mjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core/pattern.mjs b/packages/core/pattern.mjs
index cbaf8a8a2..abe613d19 100644
--- a/packages/core/pattern.mjs
+++ b/packages/core/pattern.mjs
@@ -2928,7 +2928,7 @@ export const drop = stepRegister('drop', function (i, pat) {
  * ).pace(8)
  */
 export const extend = stepRegister('extend', function (factor, pat) {
-  return pat.fast(factor).expand(factor);
+  return pat.repeatCycles(factor).fast(factor).expand(factor);
 });
 
 /**

From c2a5562bad41bea5192e089b040ddc7156f51580 Mon Sep 17 00:00:00 2001
From: Felix Roos <flix91@gmail.com>
Date: Mon, 20 Oct 2025 21:24:13 +0200
Subject: [PATCH 2/4] add new flavour under replicate

---
 packages/core/pattern.mjs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/packages/core/pattern.mjs b/packages/core/pattern.mjs
index fdf27e9fc..f5b0c676e 100644
--- a/packages/core/pattern.mjs
+++ b/packages/core/pattern.mjs
@@ -2995,6 +2995,24 @@ export const drop = stepRegister('drop', function (i, pat) {
  * ).pace(8)
  */
 export const extend = stepRegister('extend', function (factor, pat) {
+  return pat.fast(factor).expand(factor);
+});
+
+/**
+ * *Experimental*
+ *
+ * `replicate` is similar to `fast` in that it increases its density, but it also increases the step count
+ * accordingly. So `stepcat("a b".replicate(2), "c d")` would be the same as `"a b a b c d"`, whereas
+ * `stepcat("a b".fast(2), "c d")` would be the same as `"[a b] [a b] c d"`.
+ *
+ * TODO: find out how this function differs from extend
+ * @example
+ * stepcat(
+ *   sound("bd bd - cp").replicate(2),
+ *   sound("bd - sd -")
+ * ).pace(8)
+ */
+export const replicate = stepRegister('replicate', function (factor, pat) {
   return pat.repeatCycles(factor).fast(factor).expand(factor);
 });
 

From 188f0e90984b61bf0275b40da7af6edbb9f77aec Mon Sep 17 00:00:00 2001
From: Felix Roos <flix91@gmail.com>
Date: Mon, 20 Oct 2025 21:35:28 +0200
Subject: [PATCH 3/4] snapshot

---
 test/__snapshots__/examples.test.mjs.snap | 27 +++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/test/__snapshots__/examples.test.mjs.snap b/test/__snapshots__/examples.test.mjs.snap
index 937d42797..d7e13d4d9 100644
--- a/test/__snapshots__/examples.test.mjs.snap
+++ b/test/__snapshots__/examples.test.mjs.snap
@@ -8307,6 +8307,33 @@ exports[`runs examples > example "repeatCycles" example index 0 1`] = `
 ]
 `;
 
+exports[`runs examples > example "replicate" example index 0 1`] = `
+[
+  "[ 0/1 → 1/8 | s:bd ]",
+  "[ 1/8 → 1/4 | s:bd ]",
+  "[ 3/8 → 1/2 | s:cp ]",
+  "[ 1/2 → 5/8 | s:bd ]",
+  "[ 5/8 → 3/4 | s:bd ]",
+  "[ 7/8 → 1/1 | s:cp ]",
+  "[ 1/1 → 9/8 | s:bd ]",
+  "[ 5/4 → 11/8 | s:sd ]",
+  "[ 3/2 → 13/8 | s:bd ]",
+  "[ 13/8 → 7/4 | s:bd ]",
+  "[ 15/8 → 2/1 | s:cp ]",
+  "[ 2/1 → 17/8 | s:bd ]",
+  "[ 17/8 → 9/4 | s:bd ]",
+  "[ 19/8 → 5/2 | s:cp ]",
+  "[ 5/2 → 21/8 | s:bd ]",
+  "[ 11/4 → 23/8 | s:sd ]",
+  "[ 3/1 → 25/8 | s:bd ]",
+  "[ 25/8 → 13/4 | s:bd ]",
+  "[ 27/8 → 7/2 | s:cp ]",
+  "[ 7/2 → 29/8 | s:bd ]",
+  "[ 29/8 → 15/4 | s:bd ]",
+  "[ 31/8 → 4/1 | s:cp ]",
+]
+`;
+
 exports[`runs examples > example "reset" example index 0 1`] = `
 [
   "[ 0/1 → 1/8 | s:hh ]",

From 20e5fdedfbce14cb0ce8fd84ccdf0cf35da3875c Mon Sep 17 00:00:00 2001
From: Felix Roos <flix91@gmail.com>
Date: Mon, 20 Oct 2025 21:38:43 +0200
Subject: [PATCH 4/4] fix: use replicate for ! in mondo

---
 packages/mondough/mondough.mjs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/mondough/mondough.mjs b/packages/mondough/mondough.mjs
index b7ee83787..e2c6dc9ad 100644
--- a/packages/mondough/mondough.mjs
+++ b/packages/mondough/mondough.mjs
@@ -5,7 +5,7 @@ import {
   slow,
   seq,
   stepcat,
-  extend,
+  replicate,
   expand,
   pace,
   chooseIn,
@@ -36,7 +36,7 @@ lib.square = (...args) => stepcat(...args).setSteps(1);
 lib.angle = (...args) => stepcat(...args).pace(1);
 lib['*'] = fast;
 lib['/'] = slow;
-lib['!'] = extend;
+lib['!'] = replicate;
 lib['@'] = expand;
 lib['%'] = pace;
 lib['?'] = degradeBy; // todo: default 0.5 not working..