0001914: IT: S7B on envelope trigger should process the first tick, and nothing else

ID	Project	Category	View Status	Date Submitted	Last Update

0001914	OpenMPT	Playback Compatibility	public	2025-08-14 22:35	2025-08-18 20:32

Reporter	mrpapersonic	Assigned To	Saga Musix
Priority	normal	Severity	minor	Reproducibility	always
Status	assigned	Resolution	open
Platform	x64	OS	Windows	OS Version	10
Product Version	OpenMPT 1.32.03.00 / libopenmpt 0.8.2 (current stable)

Summary	0001914: IT: S7B on envelope trigger should process the first tick, and nothing else
Description	at the very least for filter envelopes (maybe pitch as well). Currently, OpenMPT seems to ignore whatever is in the envelope. Impulse Tracker's (mono) WAV writer driver seems to process the first tick, and then pauses the envelope. I have not tested whether this same behavior applies to both pitch and filter envelopes. In the test case provided the first and second channel should sound identical; the second channel just plays the output from IT 2.14 patch 3's WAV writer. I'm not aware of any differences between patch 3 and patch 5. (p3 is simply what I have available right now) Schism Tracker does seem to get this right, so the code there could be used as reference.
Tags	No tags attached.
Attached Files	s7b-on-env-trigger-filter.7z (413,288 bytes)

Has the bug occurred in previous versions?	Yes, since at least latest 1.31
Tested code revision (in case you know it)	r23823

Date Modified	Username	Field	Change
2025-08-14 22:35	mrpapersonic	New Issue
2025-08-14 22:35	mrpapersonic	File Added: s7b-on-env-trigger-filter.7z
2025-08-14 22:39	mrpapersonic	Description Updated
2025-08-14 23:16	mrpapersonic	Note Added: 0006446
2025-08-18 20:32	Saga Musix	Assigned To	=> Saga Musix
2025-08-18 20:32	Saga Musix	Status	new => assigned

mrpapersonic 2025-08-14 23:16 reporter ~0006446	Changing the envelope from filter to pitch, the pitch envelope does not get processed at all (i.e. s77.it behavior is correct)