[PlanetCCRMA] M-Audio 24Ao w. updated firmware on linux nowadays ?

[Fernando Lopez-Lezcano]

On 10/27/20 1:00 AM, anders.vinjar at bek.no wrote:
> Hi Fernando, thanks for pointers to thread with much info.
> 
>>>>>> "F" == Fernando Lopez-Lezcano <nando at ccrma.Stanford.EDU> writes:
> 
>      F> If the hardware you have can be downgraded (I believe to 1.2.8+
>      F> or something like that) then do that and you should be
>      F> fine. Regretfully newer hardware versions cannot be downgraded.
> 
> Seems 'downgradabililty' is the only working solution then, based on
> various descriptions about random buzzy sounds etc.
> 
> Will attempt downgrading, but only after next concert is done (served by
> other OS'es)
> 
> So using somewhere around 1.2.8 i can hope for nice playing without
> occasional buzzy noise + i can expect getting 64 channels out of that
> card?


Yes if your card supports it. Hopefully you can do that (depends on how 
old your hardware is).

I have been using the Motu AVB world for a couple of quite complex 
systems at CCRMA. It is a love/hate relationship. The craziest system is 
the Stage control system. This is our small concert hall and it has now 
a 56.8 speaker system - a computer running custom software and 8 Motu 
audio interfaces connected through AVB that drive everything. Users 
connect to selected Motu audio interfaces to access the system (through 
USB).

Even then, occasionally I get buzzy things going (it sounds like a tiny 
bzzt that repeats periodically, one or two second interval). So the 
system is not absolutely 100% glitch free. I think that with the new 
kernels and driver tweaks it would be less frequent (still running 
rather old stuff there).

(my problem is that, for example, that system depends on 64 channels 
over USB[*] and the newer firmware does not do that for class compliant 
mode - thus all the work to get this to work on newer firmware/hardware)

Best luck!
-- Fernando


[*] the ultimate solution would be native AVB on Linux, then we could 
ditch USB... some work has been done on that but I have not yet tried it 
out...