On 08.06.2010 11:12, david wrote:
Nicolas BERCHER wrote:
On 06.06.2010 23:44, Ken Restivo wrote:
On Sun, Jun 06, 2010 at 10:15:03AM -0400, Dave Phillips wrote:
Nicolas BERCHER wrote:
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).
Try putting a MIDI monitor program between the keyboard's MIDI output
and QSynth's input port in QJackCtl. Look for the repeats there.
If you have KDE: http://kmidimon.sourceforge.net/
For Gnome/GTK: http://home.gna.org/gmidimonitor/
For none of the above (my preference): aseqdump :-)
-ken
Thank you for answers.
Yes, I also prefer command line tools! ;-)
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.
The keyboard seems to do things right, so I think it comes from qsynth.
Isn't that strange? I mean many people around there use qsynth, am I
the only one to have this kind of problem?
Hmm, have never had QSynth repeat a note unless I actually repeated a
note. Interesting. I don't know the innards of MIDI events, so don't
know what the various numbers above mean.
WAGging around: Is your USB MIDI connection sharing a USB bus with
other USB devices? Maybe some other USB device is doing something
weird with the bus and something isn't getting handled right?
# lsusb
Bus 002 Device 005: ID 0763:0192 Midiman M-Audio Keystation 88es
Bus 002 Device 002: ID 413c:2003 Dell Computer Corp. Keyboard
Bus 002 Device 003: ID 0461:4d15 Primax Electronics, Ltd Dell Optical Mouse
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 004: ID 0bda:0103 Realtek Semiconductor Corp. USB 2.0
Card Reader
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
I guess you're right: I have 2 USB buses (one onboard (2nd) and one in
front (1st), inside a memory cards reader) and the midi keyboard shares
the 2nd bus with mouse and azerty keyboard...
I noticed there's no way to plug an usb device on the 1st bus: it only
cares about memory cards.
So I unplugged both mouse & azerty keyboard but it doesn't change anything.
Do you think this problem could come from an hardware failure into my SB
Live sound card?
Nicolas.
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