Author Topic: VSTi note-end problem?  (Read 666 times)

Offline geckon

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VSTi note-end problem?
« on: March 07, 2019, 20:50:45 »
Hi there,

I've been using OpenMPT with VSTis for quite a while and have had generally few problems with it. One of the persistent problems that has occurred with different VST instruments, however, is that the volume of a VST instrument is "reset" to the highest volume possible when I send a note-end command (==). This is undesirable because other notes played by the same instruments get louder, and the fade-out gets louder as well.

The problem can be remedied by using a volume effect command next to the note-end command, but this is tiresome to do over and over again.

This has occurred on several different VSTs, including Roland Sound Canvas VA, SampleTank 3 (free version), etc. I thought I might be missing something because others have probably also experienced it when using VSTis with OpenMPT.. Is there any way I can fix this behaviour?

Thanks for your help.

Offline LPChip

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Re: VSTi note-end problem?
« Reply #1 on: March 07, 2019, 21:00:52 »
Do you happen to have auto-gain enabled? If so, disable it.

Also, a compressor or limiter on your track will essentially do the same thing if misconfigured.
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Offline geckon

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Re: VSTi note-end problem?
« Reply #2 on: March 07, 2019, 21:03:39 »
Thanks for your quick response. I have OpenMPT at the default settings, so there's no auto-gain enabled (unless it's on by default). I don't have any other plug-ins other than the VST (the same thing happens on a fresh project, with nothing added but a VST and one note).

Offline Saga Musix

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Re: VSTi note-end problem?
« Reply #3 on: March 07, 2019, 22:18:11 »
I'll grab Sound Canvas VA (Roland Cloud Manager is annoying as always so this might take a while...) but generally this should of course not happen, and I have not seen it happening with other Roland plugins. LPChip's suggestions are both extremely unrealistic (yes a compressor or automatic gain control will make things louder, but certainly not in an instant and whenenver a note-off is encountered - in particular automatic gain control is not capable of doing that), if it's not a plugin bug I'd more expect some weird instrument settings or pattern data causing this problem. Generally it's always handy to have a minimal test file to reproduce the problem with.
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Offline geckon

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Re: VSTi note-end problem?
« Reply #4 on: March 07, 2019, 22:25:32 »
Oh, I forgot to mention it, but I have volume command handling set like this for my VSTs.


Thanks in advance.

Offline Saga Musix

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Re: VSTi note-end problem?
« Reply #5 on: March 07, 2019, 22:34:23 »
Ah yes, I see now, this exact combination of volume configuration parameters is causing issues. I'll have a closer look during the weekend.
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Offline geckon

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Re: VSTi note-end problem?
« Reply #6 on: March 07, 2019, 22:43:57 »
Thank you! Having someone look into this would be a great help.

Offline Saga Musix

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Re: VSTi note-end problem?
« Reply #7 on: March 08, 2019, 22:42:16 »
The problem has been identified and will be fixed in the next OpenMPT version.
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Offline Saga Musix

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Re: VSTi note-end problem?
« Reply #8 on: March 11, 2019, 17:55:44 »
If you want, you can try out recent test builds at https://builds.openmpt.org/builds/auto/openmpt/bin.win64/1.28/ to see if the bug is fixed for you.
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