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

[Nicolas BERCHER]

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 had a similar problem and solved it by putting kmidimon between my
> keyboard and sequencer.
>
> Could it be that qsynth doesn't handle NOTE ON with
> velocity of 0 as NOTE OFF? Although I imagine that translation should
> be happening at a lower level... just a guess.
>    
Yes it is, you're right, but it happens only for 4 notes among 88 I can 
play!
If this putting kmidimon between my keyboard and qsynth can solve the 
problem, I'd also like to understand why. Does it mean there exist 
multiple midi standard to describe note on/off events?
Nicolas.