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IDProjectCategoryView StatusLast Update
0001344OpenMPTPlayer input plugins (xmp-openmpt, in_openmpt)public2020-08-25 11:33
ReporterWizArthur Assigned ToSaga Musix  
Status assignedResolutionopen 
Platformx64OSWindowsOS Version7
Product VersionOpenMPT / libopenmpt 0.5.0 (upgrade first) 
Summary0001344: Tuning issue in Impulse Tracker file with Amiga pitch slides

The tuning of the portamentos in the melodies (starting at 0:30) of the attached song often go sharp of the target note. This issue has stumped me since '99 because it has played back differently in almost every player outside of IT. Best guess is that it is related to the Amiga pitch slides setting (in F12 settings), possibly combined with the high octave used for leads. It almost seems to go proportionally sharper with higher notes.

I recently tested this issue in Schism 20190801, ModPlug Player 1.46.02, XMPlay 3.8.4, and foo_openmpt54 0.5.0. Most players sounded similarly out of tune with only XMPlay getting close to IT.

The attachment includes the original IT file as well as a short clip with accurate pitch rendered using IT 2.14's stereo WAV writer.

TagsNo tags attached.
Has the bug occurred in previous versions?Yes
Tested code revision (in case you know it)




2020-06-27 15:37

reporter (479,154 bytes)
Saga Musix

Saga Musix

2020-06-27 16:08

administrator   ~0004390

Last edited: 2020-08-25 11:33

Amiga pitch slides in IT are indeed a bit weird and finnicky. It's been on my to-do list for a very long time to look into them and try to fix them...

Note to self: relevant sackit2 commit

Issue History

Date Modified Username Field Change
2020-06-27 15:37 WizArthur New Issue
2020-06-27 15:37 WizArthur File Added:
2020-06-27 16:08 Saga Musix Note Added: 0004390
2020-06-27 17:06 Saga Musix Assigned To => Saga Musix
2020-06-27 17:06 Saga Musix Status new => assigned
2020-08-25 11:33 Saga Musix Note Edited: 0004390