On a sunny day (Thu, 7 Jan 2021 20:35:13 -0000 (UTC)) it happened Jim Jackson
 wrote in :

>On 2021-01-07, Folderol  wrote:
>> On Thu, 7 Jan 2021 19:55:15 -0000 (UTC)
>> Jim Jackson  wrote:
>>
>> I don't know that it will make a difference on the Pi, but it certainly does
on
>> Intel and AMD processors. Typically I can go from 8mS latency down to 2mS on
>> complex Yoshimi 10-12 Channel performances.
>>
>
>Ok that's certainly worth it. Sorry I can't help re. RT linux kernel and RPI.
>Maybe try the advanced section of the RPI forum? Though I do find that it's
not often "advanced".

Linux, RT or not, is not a real time system.
It is a multi-tasker.
I usually design some extra hardware if things need to run fast and
continuously.
hardware that includes buffers.
example:
 http://panteltje.com/panteltje/raspberry_pi_dvb-s_transmitter/

Much these days can perhaps be done with an FPGA hat (have not tried that).
Else you will need to do some electronic design, soldering, etc.
In any case you also need to write the software to interface to that,
You need to specify your requirements.

Sometimes a simple PIC micro-controller is all you need to add to get past the
task switch interrupt..
But it will need to be programmed too.

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