From 89198ec37eb976617c39e49375158adb3fc5f56a Mon Sep 17 00:00:00 2001
From: c0dev0id <sh+git@codevoid.de>
Date: Wed, 24 Jun 2026 16:41:12 +0200
Subject: [PATCH] Fix serializeModulation field names; add mod:base test
 assertion

---
 static/exporter.js | 12 ++++++------
 test-parser.mjs    |  1 +
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/static/exporter.js b/static/exporter.js
index 734d6b8..92d941c 100644
--- a/static/exporter.js
+++ b/static/exporter.js
@@ -23,12 +23,12 @@ function serializeShape(shape) {
 // ── FM / AM modulation ─────────────────────────────────────────────────────
 // RFC §3.2.1.1.6-7: FM = FREQUENCY ["f"/"F"] ["@" OSC] ["[" SHAPE "]"] ";" MOD ":" BASE
 
-function serializeModulation(fm) {
-    let s = String(fm.frequency ?? '');
-    if (fm.factor) s += fm.factor;
-    if (fm.osc) s += `@${fm.osc}`;
-    if (fm.shape) s += `[${serializeShape(fm.shape)}]`;
-    s += `;${fm.mod ?? ''}:${fm.base ?? ''}`;
+function serializeModulation(m) {
+    let s = String(m.frequency ?? '');
+    if (m.oscillator) s += `@${m.oscillator}`;
+    if (m.shape) s += `[${serializeShape(m.shape)}]`;
+    s += `;${m.mod_share ?? ''}:${m.base_share ?? ''}`;
+    if (m.init_phase != null) s += m.init_phase >= 0 ? `+${m.init_phase}` : String(m.init_phase);
     return s;
 }
 
diff --git a/test-parser.mjs b/test-parser.mjs
index babfaef..2c39db9 100644
--- a/test-parser.mjs
+++ b/test-parser.mjs
@@ -243,6 +243,7 @@ ok('FM shape start', fm?.shape?.start === '6' || fm?.shape?.start === 6);
 fmInstr.isDirty = true;
 const fmOut = exportInstrument(fmInstr);
 ok('FM exported with [shape]', /FM:.*\[.*\]/.test(fmOut));
+ok('FM exported with mod:base', /FM:.*;\d+:\d+/.test(fmOut));
 
 // ── Summary ────────────────────────────────────────────────────────────────
 console.log(`\n══ ${pass} passed, ${fail} failed ══\n`);