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-rw-r--r--gtk2_ardour/time_fx_dialog.cc5
1 files changed, 5 insertions, 0 deletions
diff --git a/gtk2_ardour/time_fx_dialog.cc b/gtk2_ardour/time_fx_dialog.cc
index 829ffd6504..caf1191835 100644
--- a/gtk2_ardour/time_fx_dialog.cc
+++ b/gtk2_ardour/time_fx_dialog.cc
@@ -224,6 +224,11 @@ TimeFXDialog::start_updates ()
void
TimeFXDialog::update_progress_gui (float p)
{
+ /* time/pitch FX are applied in a dedicated thread, so we cannot just
+ update the GUI when notified about progress. That is deferred to a
+ timer-driven callback which will ensure that the visual progress
+ indicator is updated.
+ */
progress = p;
}