Drumgizmo humanizer causes delay

[cobalt]

Since I upgraded to Ardour 7.5 from 7.4 all my songs sounds terrible. I pinpointed the problem to the Drumgizmo tracks, which look ok, but on playback, every drum sound is slightly delayed (_100ms) so the midi drum track gets out of sync with all the audio tracks (bass, guitars, vocals). When muting the drums the other sound fine together.
I now use Ardour 8.1 but the problem persists.

When I disable Timing humanizer in DG it snaps back into sync. Is this a known problem? The humanizer is a great function, but I can't use it anymore. Is it possible to troubleshoot if it's due to DG or Ardour?

[bluebell]

Since I upgraded to Ardour 7.5 from 7.4 all my songs sounds terrible. I pinpointed the problem to the Drumgizmo tracks, which look ok, but on playback, every drum sound is slightly delayed (_100ms) so the midi drum track gets out of sync with all the audio tracks (bass, guitars, vocals). When muting the drums the other sound fine together.
I now use Ardour 8.1 but the problem persists.

When I disable Timing humanizer in DG it snaps back into sync. Is this a known problem? The humanizer is a great function, but I can't use it anymore. Is it possible to troubleshoot if it's due to DG or Ardour?

Did you update rubberband, too? I noticed that the v3 rubberband has a big latency. Maybe drumgizmo uses rubberband?

[deva]

This actually sounds like a potential bug in Ardour?
Timing humanizer introduces a fixed 100ms delay, which is reported to the host, so if this is somehow broken in Ardour that might be the issue

[deva]

Did you update rubberband, too? I noticed that the v3 rubberband has a big latency. Maybe drumgizmo uses rubberband?

DrumGizmo uses zita-resampler

[bluebell]

This actually sounds like a potential bug in Ardour?
Timing humanizer introduces a fixed 100ms delay, which is reported to the host, so if this is somehow broken in Ardour that might be the issue

Maybe this can be workaround-fixed by inserting the artificialLatency-plugin and setting it to 100 ms. If that doesn't work then Ardour might have some problems with its plugin latency compensation.

http://plugin.org.uk/ladspa-swh/docs/la ... th_sEc2.62

[deva]

IIRC the latency compensation can manually be set directly in the plugin "wrapper" ui. Not sure though.

[deva]

I just tested it in the latest Ardour-git and there at least the latency seems to be reported correctly in the UI; I can see the number jumping from 0ms to 150ms in the top left corner of the UI window when toggling the timing humanizer.

[cobalt]

Thanks for diving into this. Is there something I can do to help getting it resolved? I reported this issue in the Ardour discourse a while ago, but it didn't take off...

I can absolutely try the workaround with manual latency fiddling. You always learn something new