[LAU] Motu M64 Madi interface (not) class compliant?

Anders Hellquist lau at hellquist.net
Fri Mar 12 21:39:47 CET 2021

I have three Motu devices and Motu have changed their CC USB stance to only
allow 24 + 24 streams over usb.

This happened a long time ago with a firmware update for Ultralite AVB
which did support 64+64 when running 44k1 or 48k.

Newer models of Ultralite does not support downgrading to older firmware
that supports more than 32 streams.

The same seems be the case with my Motu 24ai and might be true even if
running native driver for Windows or MacOS (have not tried) Motu 24ai
supports 72 channels + avb streams so I'm total. Close to 170 channels so
the limited USB support really cripple the usage.

I have repeatedly been I contact with Motu support and the state they love
Linux and promises things will improve but so far there has been no proof
to back it up.

Motu has not changed the documentation regarding these limits and I have
pointed out the fact that they are advertising stuff that is no longer true
but they promise to fix the documentation but it is all just talk.

I would say, stay away from Motu if possible.


On Fri, Mar 12, 2021, 19:13 Chris Caudle <6807.chris at pop.powweb.com> wrote:

> On 2021-03-12 11:43, Peter P. wrote:
> > can report that the Motu M64 Madi interface does work with a limited
> > channel count of 24 for input and another 24 for output (instead of 64
> > each).
> That seems misleading on the part of MOTU.  There is no mention of that
> anywhere on the product web page, and the readme file for the "pro-audio
> driver" even has this note:
> USB audio class-compliant operation on macOS
> All of the MOTU interfaces listed on page 1 of this document are USB
> audio class-compliant on macOS. This means that you can connect them to
> any Mac running macOS 10.11 or higher using USB for multi-channel audio
> I/O without having to install any drivers.
> No mention of reduced features when using class-compliant operation.
> Is that actually a device limitation, or a linux usb audio driver
> limitation?
> --
> Chris Caudle
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> https://lists.linuxaudio.org/listinfo/linux-audio-user
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