LMMS/lmms

force mute when exporting tracks to avoid automation unmuting an instrument

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#5,533 opened on 2020年6月11日

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buggood first issue

説明

Bug Summary

When exporting tracks, all instruments except for the active one get muted. So far soo good. When I put a automation line that mutes and unmutes instruments to create a stutter effect, it gets activated by the automation line when another instrument is active. I found a workaround, which consists of the automation line muting a FX channel that is linked to the instrument.

Steps to reproduce

Open a project with several instruments, and create a automation line that mutes and unmutes an instrument. Then export tracks. Voliá there you go.

Expected behavior

The currently inactive instrument stays muted

Actual behavior

The currently inactive instrument gets unmuted

Screenshot

lmmsbug

Affected LMMS versions

I tested it in Version 1.2.1 (Linux/x86_64, Qt 5.12.8, GCC 9.3.0), but I suspect all versions where 'export tracks' exists are affected.

コントリビューターガイド

技術スタック
cpp
領域
desktop
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
1-2 days
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
stale
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
mostly clear
前提条件
Understanding of LMMS automation systemFamiliarity with track export code
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
20
調査方針
The issue describes a bug where automation unmutes instruments during track export. Investigate the export tracks functionality, likely in src/core/ExportProject.cpp or similar. Look for how muting is applied before export and how automation overrides it. The automation system in AutomationPattern.cpp may need modification to respect forced mute during export. Review comments on the issue for any additional hints or attempted fixes.