Re: [fluid-dev] Akai EWI-USB, Raspberry-Pi, and FluidSynth

[Ben Gonzales]

Hi Marcus.

Gee, that looks like fun! I hope you get a great response. You've 
obviously put a lot of work into the project.

I haven't actually measured the latency. All I know is that the sound 
comes out without enough delay to annoy me! I take it you'd need an 
oscilloscope or similar to measure it?

The R-Pi is a model 2, so it's more powerful than the original Pi, and 
since I play only one note at a time, I guess that keeps the load down. 
There's no GUI, of course. The system load is usually <15%.


Ben

On 31/10/15 22:16, Marcus Weseloh wrote:
> Hi Ben,
>
> very interesting project, thanks for sharing! I'm also working on a
> (commercial) project with Fluidsynth on ARM hardware, but I'm using an
> Allwinner A20 SOM board. I'm producing it commercially, because I'm
> also developing the controller hardware (the instrument itself, with
> all the keys etc). But the whole software stack will be released as
> open-source. More details on http://www.midigurdy.com
>
> Amazing that you get a good latency response with a stock raspbian
> kernel. I'm using a preempt-rt enabled kernel with hand-optimized IRQ
> priorities and that gives me a latency (from key press to start of
> sound) of about 12-15ms, which is acceptable. But then again, my
> system not only runs FluidSynth to produce the sound but also handles
> all the sensor inputs, modellig of sensor values to MIDI events and
> other stuff.
>
> Have you made any measurements of the actual latency?
>
> Cheers,
>
>      Marcus
>
> 2015-10-30 22:00 GMT+01:00 Ben Gonzales <address@hidden>:
> > Hi all.
> >
> > I'm running my EWI-USB through a Raspberry-Pi 2 using FluidSynth. It was a
> > challenging project, and it now works well.
> >
> > Here's the web page: http://projects.gonzos.net/ewi-pi/
> >
> > Interesting features:
> >
> > - I configure the running FluidSynth using a smartphone accessing the R-Pi
> > via wifi (no need for a screen/keyboard/buttons)
> > - The PHP code talks to FluidSynth using the telnet port 9800
> > - The PHP code talks to the EWI using ALSA commands via a bash script
> >
> > Ben
> >
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