[LAU] FluidSynth fails to sintetize more 85% events generated by Drum machine ALESIS D4.

[Ken Ellinwood]

Mr Jedi Storm,

I'm cc'ing the audio-user list again since others may be able to help.  

I use midi files instead of an actual hardware device like you do.  I run a (home-made) utility which strips out the note-off events from the percussion track and saves the updated midi file.  I then play back the resulting file with fluidsynth and the problem goes away.

In your case you will need to configure a program to filter the events out before they get to fluidsynth.   I've never done this kind of filtering so I don't know which software to recommend, but assuming such a real-time midi filter exists, it should be possible to create a chain by connecting the alsa ports of the various applications together correctly and make this all work. 

Ken

--- On Thu, 9/10/09, Jedi Storm <jedi00 at gmail.com> wrote:

From: Jedi Storm <jedi00 at gmail.com>
Subject: Re: [LAU] FluidSynth fails to sintetize more 85% events generated by  Drum machine ALESIS D4.
To: "Ken Ellinwood" <kellinwood at yahoo.com>
Date: Thursday, September 10, 2009, 6:07 PM

KEn , 

Excuseme but what do you mean with ; strip out the note-off events in the percussion tracks altogether ? 

I've the posibility to change default Instrument bank position as well with an editor ...


Thank you very very much ! 


2009/9/11 Ken Ellinwood <kellinwood at yahoo.com>


It doesn't matter if they are note-off or note-on with a velocity=0, fluidsynth treats both as note-off events.  You are experiencing a bug which occurs when a note-on is followed shortly by a note-off or note-on-velocity-zero event.  If the temporal spacing between the two events is short enough that fluidsynth processes both events during the same cycle, then audio for the note-on is never generated.  This occurs most frequently with percussion tracks since the note-on and note-offs are spaced very closely together.   The only solution I've found is to strip out the note-off events in the percussion tracks altogether.   Its a pain, but works pretty well.


Ken

--- On Thu, 9/10/09, James Cameron <quozl at us.netrek.org> wrote:


From: James Cameron <quozl at us.netrek.org>
Subject: Re: [LAU] FluidSynth fails to sintetize more 85% events generated by Drum machine ALESIS D4.
To: linux-audio-user at lists.linuxaudio.org

Date: Thursday, September 10, 2009, 4:10 PM

On Thu, Sep 10, 2009 at 07:36:06PM +0200, Jedi Storm wrote:
> MIDI Keyboard or Virtual Keyboard generate NOTE ON and NOTE OFF events , The

> alesis D4 only generates NOTE ON midi events.

This will be the cause of the symptom.

Change the D4 configuration to generate NOTE OFF events?

I've checked, and fluidsynth has no documented option for inventing the

NOTE OFF events, so you have to generate them.

I've briefly googled, and there are mentions of changing the D4 to
generate NOTE OFF events.  I'm not familiar with the D4 myself though.

-- 
James Cameron

http://quozl.linux.org.au/
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