On Fri, 8 Jan 2021 23:38:47 +0000 (UTC)
not@telling.you.invalid (Computer Nerd Kev) wrote:

>Folderol  wrote:
>> Does anyone know if it is reasonably easy to get an RT kernel running on the
Pi?
>> I'm using devuan beowulf to get a small footprint install *without* either
>> systemd or pulseaudio.
>>
>> Actually, this is already better than the official OS when running purely
with
>> ALSA.
>
>You don't say what you're actually doing. I gather that it's some
>software audio synth, and I don't know anything about that
>application. I'm guessing it's probably existing Linux software
>though, so suggestions such as building for bare-metal or another
>OS are presumably not worthwhile.
>
>There's a lot of info here, though not Pi-specific. Setting CPU
>frequency scaling to "performance" was important for my application
>(I also needed to disable video output on HDMI/Composite):
>https://wiki.linuxaudio.org/wiki/system_configuration
>
>Real-Time patches for the Linux Kernel:
>PREEMPT_RT: https://wiki.linuxfoundation.org/realtime/start
>Xenomai
>RTAI
>
>There is a PREEMPT_RT patched Linux distro for the Pi (this one
>worked alright for me on a Pi Zero and seems to be fairly actively
>developed, there might be others that I've forgotten about):
>https://guysoft.wordpress.com/2017/10/09/realtimepi/

Thanks for all this further information.
It is indeed a software synthesiser, but a very unusual one. Whereas most of
these either work on sound samples, or previously generated wavetables, Yoshimi
creates everything on-the-fly from mathematical formulae. These can make
dynamic changes within individual cycles, resulting in incredibly rich sounds.

I do quite a lot of work on the overall structure but don't touch these sound
'engines' - I leave that to those with far better understanding or the
mathematics!

--
W J G

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