On Tue, 08 Jun 2010 11:37:23 +0200 Nicolas BERCHER <nbercher@xxxxxxxx> wrote: > On 08.06.2010 11:21, David Santamauro wrote: > > > > Hi, > > > > On Tue, 08 Jun 2010 10:57:13 +0200 > > Nicolas BERCHER<nbercher@xxxxxxxx> 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. Sorry, I re-read the initial post -- 4 notes, hrmmm. That points to a hardware issue but aseqdump doesn't show additional events. Although I haven't delved into the code, the translation of NOTE ON (0) to NOTE OFF should be happening at a much lower level than user-space software. There is one standard for midi note on/off and it is clear that note on (0) must be interpreted as note off. Have you tried playing it back through a different sound generator, possibly external gear attached to your 20:0 port? Just as a test, what is registered when you route your keyboard into kmidimon and route kmidimon into qsynth (all defaults, simple piano patch) - does kmidimon show 1 note-on/note-off only - does qsynth output correctly? David _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
