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Re: [fluid-dev] Fluidsynth make strange sounds with ALSA

From: Ceresa Jean-Jacques
Subject: Re: [fluid-dev] Fluidsynth make strange sounds with ALSA
Date: Thu, 14 Dec 2017 01:05:02 +0100 (CET)


On this type of hardware (Orange Pi pc or RPi 2,...), the audio (on jack 3.5) is a PWM signal (very low quality signal and very noisy) and the audio driver doesn't work very well for low latency.

For example , with –o audio.period=1 audio.period-size=1024 , we obtain a distorted sound when the number of voices reachs 80 voices. This issue disapears if we

use 2, 3, or 4 cores (using the option -o synth.cpu-cores=4). But at low audio level (i.e during note release time) the sound becomes very noisy.

I we ignore this jack 3.5 output and we plug an audio usb card, we get good quality and very low latency (about 4 ms with a sample rate 44100) using this settings:

-o audio.alsa.device=hw:1 -o audio.period-size=256 -o synth.cpu-cores=4.

With this settings you should excect playing 200 voices maximum (i.e 50 voices max for each core).


Also, we probably could use the audio on hdmi port. But i haven't not tested it. If you intend to do this test, your report on this list will be very appreciated.





> Message du 13/12/17 19:56
> De : "Даниль Нигаматзянов" <address@hidden>
> A : address@hidden
> Copie à :
> Objet : [fluid-dev] Fluidsynth make strange sounds with ALSA
> Hello! Sorry if my English is bad! I have some midi device (Arduino homemade drum set), and I use FluidSynth. When I tested it on my desktop computer, it works well, but I have a little delay. I think, it because I use PulseAudio. Now, I want to use FluidSynth on Orange Pi mini computer. I don't use PulseAudio on Pi device, just ALSA. And I have a problem! At the beginning, this works well, with low latency, but if I play more intensive it break the sound and I cant't hear nothing but noise. If I restart FluidSynth, it fix problem for some time, but after several seconds of minutes it breaks again. If I don't restart FluidSynth and just wait untill the noise get down, the problem resolved itself, and FluidSynth works well for another several seconds/minutes. My FluidSynth version is 1.1.6 Thank You and sorry for my English again! -- Даниль Нигаматзянов <address@hidden> _______________________________________________ fluid-dev mailing list address@hidden https://lists.nongnu.org/mailman/listinfo/fluid-dev

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