From ca4b87d43d2f23ecd7e021f0e7156b624fd464f7 Mon Sep 17 00:00:00 2001
From: "5684185+vsariola@users.noreply.github.com"
 <5684185+vsariola@users.noreply.github.com>
Date: Tue, 27 Jan 2026 23:10:53 +0200
Subject: [PATCH] fix(vm): nans in the Go VM trisaw oscillator when the color
 was 0

---
 CHANGELOG.md   | 1 +
 vm/go_synth.go | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b090da..f310d8f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   roughly to -12 dBFS true peak. ([#211][i211])
 
 ### Fixed
+- Occasional NaNs in the Trisaw oscillator when the color was 0 in the Go VM.
 - The tracker thought that "sync" unit pops the value from stack, even if the VM
   did not, resulting it claiming errors in patches that worked once compiled.
 
diff --git a/vm/go_synth.go b/vm/go_synth.go
index 446b869..2391dd4 100644
--- a/vm/go_synth.go
+++ b/vm/go_synth.go
@@ -500,7 +500,7 @@ func (s *GoSynth) Render(buffer sointu.AudioBuffer, maxtime int) (samples int, r
 							*statevar -= float32(int(*statevar+1) - 1)
 							phase := *statevar
 							phase += params[2]
-							phase -= float32(int(phase))
+							phase -= float32(int(phase+1) - 1)
 							color := params[3]
 							switch {
 							case flags&0x40 == 0x40: // Sine