From 903c065e2634880b39b6c059027f0a41f5f02d3f Mon Sep 17 00:00:00 2001
From: alex <alex@slab.org>
Date: Fri, 22 Apr 2022 17:02:21 +0100
Subject: [PATCH] Use mathematical `mod` in slowcat, fixes #85

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

diff --git a/packages/core/pattern.mjs b/packages/core/pattern.mjs
index c681cf29..15d0c7eb 100644
--- a/packages/core/pattern.mjs
+++ b/packages/core/pattern.mjs
@@ -3,7 +3,7 @@ import Fraction from './fraction.mjs';
 import Hap from './hap.mjs';
 import State from './state.mjs';
 
-import { isNote, toMidi, compose, removeUndefineds, flatten, id, listRange, curry } from './util.mjs';
+import { isNote, toMidi, compose, removeUndefineds, flatten, id, listRange, curry, mod } from './util.mjs';
 
 export class Pattern {
   // the following functions will get patternFactories as nested functions:
@@ -828,7 +828,7 @@ export function slowcat(...pats) {
   pats = pats.map(reify);
   const query = function (state) {
     const span = state.span;
-    const pat_n = Math.floor(span.begin) % pats.length;
+    const pat_n = mod(span.begin.sam(), pats.length);
     const pat = pats[pat_n];
     if (!pat) {
       // pat_n can be negative, if the span is in the past..