[LAU] Sustain pedal issue with undesired repeated notes (m-audio keystation 88es + qjackctl + qsynth)

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Hi,

I have a problem I can't face alone on the digital piano I made on
Debian Lenny with qsynth (v0.2.5-2.2), qjackctl (v0.3.2-1) and an
m-audio keystation 88es keyboard.

When I play the piano, some notes will repeat themselves after a few
seconds only if I keep the sustain pedal pressed, just like a delay
effect would do.
I reported that only 4 notes are concerned for the moment, they have
different repeat delays:
G : ~7.5 sec (G4)
G# : ~7 sec (G#4)
A : ~6.5 sec (A4)
A# : ~6 sec (A#4)
Note that the notes above, relatively to the middle C of a piano
keyboard called C3, goes from G4 to A#4.

Could this be due to an hardware issue in the m-audio keyboard?

Thanks a lot for any idea on how to track down and correct this (if
possible).
Nicolas.
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Messages in current thread:
[LAU] Sustain pedal issue with undesired repeated notes (m-a..., Nicolas BERCHER, (Sun Jun 6, 1:08 pm)
[LAU] KMidimon ports (was Re: Sustain pedal issue with undes..., Pedro Lopez-Cabanillas, (Thu Jun 10, 8:25 am)
Re: [LAU] KMidimon ports (was Re: Sustain pedal issue with u..., David Santamauro, (Thu Jun 10, 11:37 am)