Dear Jean-Jacques,
Thank you for your tips.
I just discovered the settings (-o) and its pretty impressive!
My issue is actually fixed: the default audio.period-size parameter (64) was
too low. 128 was still to low, 256 gave a perfect sound! The whole synthesizer
sounds very reactive, no latency to my ears.
Just for my own satisfaction, I could not find who is the default
audio.alsa.device. The help output tells me that it is "default". Aplay lists
what follows:
odrodroid@odroid:~$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
sysdefault:CARD=ODROIDHDMI
ODROID-HDMI,
Default Audio Device
dmix:CARD=ODROIDHDMI,DEV=0
ODROID-HDMI,
Direct sample mixing device
dsnoop:CARD=ODROIDHDMI,DEV=0
ODROID-HDMI,
Direct sample snooping device
hw:CARD=ODROIDHDMI,DEV=0
ODROID-HDMI,
Direct hardware device without any conversions
plughw:CARD=ODROIDHDMI,DEV=0
ODROID-HDMI,
Hardware device with all software conversions
sysdefault:CARD=ODROIDDAC
ODROID-DAC,
Default Audio Device
dmix:CARD=ODROIDDAC,DEV=0
ODROID-DAC,
Direct sample mixing device
dsnoop:CARD=ODROIDDAC,DEV=0
ODROID-DAC,
Direct sample snooping device
hw:CARD=ODROIDDAC,DEV=0
ODROID-DAC,
Direct hardware device without any conversions
plughw:CARD=ODROIDDAC,DEV=0
ODROID-DAC,
Hardware device with all software conversions
sysdefault:CARD=Micro
Default Audio Device
But "-a alsa -o audio.alsa.device=plughw:0" or "hw:0" do not give any kind of
sound (perfect mute). dmix/dsnoop fail to open.
Again, thank you all for taking care of this.
HLB
> Message du 19/11/19 19:17
> De : "Ceresa Jean-Jacques"
> A : "EtienneBesançon" , "FluidSynthmailinglist"
> Copie à :
> Objet : Re: [fluid-dev] Distorted Sound with FluidSynth + Alsa on a SBC
>
>
> Hi Etienne,
> > odroid@odroid:~$ fluidsynth -C0 -R0 -r 44100 -c2 -v -d -a alsa -m alsa_seq
> > /home/odroid/Documents/bandoneon_v2.sf2
> Here some tips. Those result on experimention using Raspberry device.
> 1) Avoiding lost of precious cpu cycles:
> 1.1) Setting reverb and chorus off: Use -C0 -R0.
> 1.1) Never use -v and -d option permanently. Both consume a lot of precious
> cpu cycles.
> 2) Allowing fluidsynth sufficient time to compute things:
> 2.1) Prefer low sample rate: 44100Hz (avoid 96000Hz):
> 2.2)Avoid -c2 option and prefer -o audio.periods=xx , also use -o
> audio.period-size=yy to choose the size of each buffer.
> First use Alsa driver before trying using Alsa hardware device layer.
> Play one note using "noteon" command before trying playing note from your
> MIDI controller.
> The first thing to do is choosing high value for xx and yy.Then when a one
> note sounds fine you could try to diminish xx, yy to
> get lower latency as possible.
>
> Have you solved your issue ?
> What settings did you use when you got a distorded sound ?
> jjc.
>
> Message du 15/11/19 18:57
> De : "Etienne Besançon"
> A : fluid-dev@nongnu.org
> Copie à :
> Objet : Re: [fluid-dev] Distorted Sound with FluidSynth + Alsa on a SBC
>
>
> > Thanks for reactivity,
> >
> > Pulse audio is now uninstalled.
> >
> > I was able to get sound from Alsa:
> >
> > odroid@odroid:~$ aplay -l
> > **** List of PLAYBACK Hardware Devices ****
> > card 0: ODROIDHDMI [ODROID-HDMI], device 0: SPDIF PCM dit-hifi-0 []
> > Subdevices: 1/1
> > Subdevice #0: subdevice #0
> > card 1: ODROIDDAC [ODROID-DAC], device 0: PCM5102 HiFi pcm5102-0 []
> > Subdevices: 1/1
> > Subdevice #0: subdevice #0
> >
> > odroid@odroid:~$ aplay -D hw:CARD=ODROIDDAC,DEV=0 Desktop/foo.wav
> > Playing WAVE 'Desktop/foo.wav' : Signed 16 bit Little Endian, Rate 44100
> > Hz, Stereo
> > ^CAborted by signal Interrupt...
> >
> > Fluidsynth gets right rate:
> >
> > odroid@odroid:~$ fluidsynth -C0 -R0 -r 44100 -c2 -v -d -a alsa -m alsa_seq
> > /home/odroid/Documents/bandoneon_v2.sf2
> > Changing the rate has an expected impact: even distorted, switching from
> > 48000 to 96000 will increase the notes of one octave.
> > I also try to change the soundfont without improvement.
> >
> > Indeed, the CPU is a 32-bits Cortex-A5…
> >
> > HLB
> >
> >
> >
> >
> Message du 15/11/19 10:26
> De : "Philippe Simons"
> A : "FluidSynth mailing list"
> Copie à : "Etienne Besançon"
> Objet : Re: [fluid-dev] Distorted Sound with FluidSynth + Alsa on a SBC
>
>
device seems to be powerful enough.
maybe you can also try to disable 64bit floating point operations and use 32bit
with cmake enable-floats options
also if you are not using pulse at all, try to disable it completely
>
Philippe
>
On Fri, Nov 15, 2019 at 9:34 AM Marcus Weseloh wrote:
>
Hi Etienne,
>
first please try to find out if Fluidsynth is actually the problem or if there
is something wrong with your audio setup. Maybe try to play a normal wav file
via the alsa device:
>
$ aplay -D hw:1,0 /path/to/a/soundfile.wav
>
For the sound file, use one in the format that you want fluidsynth to output.
So if you want it to render 16bit 441000 audio, then try to play a stereo wav
with 16 bit and 41000 sample rate.
See if simply playing the wav file also results in distorted audio.
>
Cheers
Marcus
>
>
Am Do., 14. Nov. 2019 um 22:17 Uhr schrieb Etienne Besançon :
>
> > > Hi!
> > >
> > > I'm running FluidSynth on a Single Board Computer, a Hardkernel Odroid
> > > C1+ that is actually stacked with a audio board integrating a high-end
> > > DAC. The aim is to turn this into a MIDI expander. Long story short, that
> > > actually runs pretty good on my desktop computer but got a very distorted
> > > sound on the SBC.
> > >
> > > The MIDI instrument is well discovered:
> > > odroid@odroid:~$ lsusb
> > > Bus 001 Device 005: ID 2341:8037 Arduino SA
> > >
> > > Fluidsynth is configured as follow:
> > > odroid@odroid:~$ fluidsynth -C0 -R0 -r 44100 -v -d -a alsa -o
> > > audio.alsa.device=hw:1 -o synth.polyphony=64 -m alsa_seq
> > > /home/odroid/Documents/Bandoneon.sf2
> > > FluidSynth version 1.1.6
> > > Copyright (C) 2000-2012 Peter Hanappe and others.
> > > Distributed under the LGPL license.
> > > SoundFont(R) is a registered trademark of E-mu Systems, Inc.
> > >
> > > fluidsynth: warning: Failed to pin the sample data to RAM; swapping
> > > is possible.
> > > fluidsynth: prog 0 0 0
> > > fluidsynth: prog 1 0 0
> > > fluidsynth: prog 2 0 0
> > > fluidsynth: prog 3 0 0
> > > fluidsynth: prog 4 0 0
> > > fluidsynth: prog 5 0 0
> > > fluidsynth: prog 6 0 0
> > > fluidsynth: prog 7 0 0
> > > fluidsynth: prog 8 0 0
> > > fluidsynth: prog 9 128 0
> > > fluidsynth: warning: No preset found on channel 9 [bank=128 prog=0]
> > > fluidsynth: prog 10 0 0
> > > fluidsynth: prog 11 0 0
> > > fluidsynth: prog 12 0 0
> > > fluidsynth: prog 13 0 0
> > > fluidsynth: prog 14 0 0
> > > fluidsynth: prog 15 0 0
> > > Type 'help' for help topics.
> > >
> > > event_pre_noteon 0 60 106
> > > event_post_noteon 0 60 106
> > > fluidsynth: noteon 0 60 106 00000 36.312 3.550 0.000 0
> > > event_pre_noteoff 0 60 106
> > > event_post_noteoff 0 60 106
> > > fluidsynth: noteoff 0 60 0 00000 3.574 1
> > > event_pre_noteon 0 60 106
> > > event_post_noteon 0 60 106
> > > fluidsynth: noteon 0 60 106 00001 39.626 3.876 0.000 0
> > > event_pre_noteoff 0 60 106
> > > ^C
> > >
> > > The instrument well connected:
> > > odroid@odroid:~$ aconnect -io
> > > client 0: 'System' [type=kernel]
> > > 0 'Timer '
> > > 1 'Announce '
> > > client 24: 'Arduino Micro' [type=kernel]
> > > 0 'Arduino Micro MIDI 1'
> > > client 128: 'FLUID Synth (3113)' [type=user]
> > > 0 'Synth input port (3113:0)'
> > > odroid@odroid:~$ aconnect 24 128
> > >
> > > Well, everything looks fine but the sound I get when playing the midi
> > > instrument is very distorted, noisy. Changing the rate did not improved,
> > > playing with the buffer a little bit. Weirdly enough, switching output to
> > > pulse audio ("fluidsynth -a pulseaudio...") gives expected sounds but
> > > with a 2~3 seconds latency.
> > >
> > > Any clue about this? How can I get more details regarding what going on?
> > >
> > > Thanks!
> > > HLB
> > >
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