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

[Nicolas BERCHER]

On 08.06.2010 12:21, David Santamauro wrote:
> On Tue, 08 Jun 2010 12:15:13 +0200
> Nicolas BERCHER<nbercher at yahoo.fr>  wrote:
>
>    
>> On 08.06.2010 11:21, David Santamauro wrote:
>>      
>>> Hi,
>>>
>>> On Tue, 08 Jun 2010 10:57:13 +0200
>>> Nicolas BERCHER<nbercher at yahoo.fr>   wrote:
>>>
>>>
>>>        
>>>> So, I checked what's going on:
>>>> $ aseqdump --list
>>>>     Port    Client name                      Port name
>>>>      0:0    System                           Timer
>>>>      0:1    System                           Announce
>>>>     14:0    Midi Through                     Midi Through Port-0
>>>>     20:0    SB Live! Value [CT4870]          EMU10K1 MPU-401 (UART)
>>>>     24:0    USB Keystation 88es              USB Keystation 88es
>>>> MIDI 1 $ aseqdump -p 24:0
>>>> Waiting for data. Press Ctrl+C to end.
>>>> Source_ Event_________________ Ch _Data__
>>>>     24:0   Control change          0  64 127
>>>>     24:0   Note on                 0  82  82
>>>>     24:0   Note on                 0  82   0
>>>>     24:0   Control change          0  64   0
>>>>
>>>> The above sequence dumped by aseqdump shows only one note event
>>>> (lines 2+3: press+release) but I heard a delayed note as mentioned
>>>> in my first mail.
>>>>
>>>>          
>>> Actually, there are two note events and both are NOTE ON, one with
>>> velocity of 82 and the other 0. The velocity 0 should be
>>> interpreted as NOTE OFF.
>>>
>>>        
>> I forgot to tell you that the third dump line, which correspond to
>> the key release, appeared *after* the undesired delayed note (I've
>> kept it pressed about ten seconds).
>> So I think that the keyboard events are well interpreted by qsynth
>> since I can play piano in a standard way: notes can ring as long as I
>> want when I press/release the keys!
>>      
> Aha ... sounds like an attack issue with the soundfont. You press a
> key, there is an initial attack, the sample loops and reattacks.
>
>    - do the notes repeat if you play them staccato, i.e., key
>      on/off<  the time seen for the repeated notes to trigger?
>    
No, that's why, fortunately, I can play of the songs I want on this fake 
digital piano without any delay trouble (occurs on 4 specific notes only 
if pedal/key pressed longer than 6~7 seconds)!

>    - Have you tried a different soundfont and/or patch and is the
>      behavior identical regardless?
>    
The use of another piano sound font solved the problem.
It is sad for, as a beginner in midi and jack world, to began by using a 
corrupted sound font...!
I have to do some tests in order to be sure that the problem was caused 
by a particular corrupted sound font before I mark this thread SOLVED!

I really thank all of you, you were all of great help!
Nicolas