0001543: ULT persistent tone portamento is not persistent.

ID	Project	Category	View Status	Date Submitted	Last Update

0001543	OpenMPT	File Format Support	public	2022-01-09 03:07	2022-01-09 03:07

Reporter	Lachesis	Assigned To
Priority	low	Severity	minor	Reproducibility	always
Status	new	Resolution	open

Summary	0001543: ULT persistent tone portamento is not persistent.
Description	OpenMPT tries to unroll Ultra Tracker tone portamento instead of properly implementing it as a persistent effect. This goes about as badly as you'd expect when the portamento is expected to carry between patterns.
Steps To Reproduce	Play porta.ult (attached) in OpenMPT. The tone portamento will not play correctly as it is supposed to carry between patterns.
Additional Information	Some actual modules that rely on this: consolidation.ult carries tone portamento between orders 23 and 24 (channel 6). the earth's last defender theme.ult carries tone portamento between orders 9 and 10. This module also relies on Ultra Tracker sample "finetune", which bafflingly seems to be added directly to the GUS frequency AFTER all note/octave calculations, but I don't think I ever got around to properly diagnosing it. The relevant MikMod issue where this originally came up.
Tags	No tags attached.

Has the bug occurred in previous versions?
Tested code revision (in case you know it)

Date Modified	Username	Field	Change
2022-01-09 03:07	Lachesis	New Issue
2022-01-09 03:07	Lachesis	File Added: porta.ult.zip

Lachesis 2022-01-09 03:07 reporter	porta.ult.zip (7,845 bytes)