Bus powered Midi Interface

[Jeffrey Yue]

Hi all.
We are in the midst of testing a MTC sent by Qlab to Whole Hog 3 and a PC
running Hog. We have no issues with Hog3 getting MTC but once we plugged
into the PC laptop (via M Audio Uno), we realise that we're not seeing
MTC. I've tried different scenairos involving network Midi, ipMidi,
audio/midi interface like MOTU ultralite and tc studiokonnekt and I'm
getting intermittent result with the M Audio Uno. I've no problems sending
other Midi messages (I.e. Note one, etc.) but once it's MTC, the interface
will indicate that it's streaming MIDI but the receiving computer (via any
interface, including another M Audio-Uno) will not read the MTC stream.
Does bus-powered Midi interface has issues with MTC, specifically Uno? I
did manage to get it to work, only once, throughout my series of tests.

Any insights most appreciated.

Regards.

[Richard B. Ingraham]

Is the PC a laptop? I have seen some PC laptops where the USB ports seemed
to have differing amounts of power available to certain ports. For example
I have a little Netbook that only one of its three ports is able to power my
little travel hard drive properly.

Also if you have a USB hub and the MIDI interface is plugged into that, I
would make sure to only use a powered MIDI hub.

Is the UNO one of those little line lump style MIDI interfaces where it's
almost like a set of cables with a lump in the middle? I've found those to
be less reliable overall and it wouldn't surprise me if the input buffer on
them is small and is easily being overloaded by the amount of data from a
MTC stream. Obviously it should work, but not all MIDI interfaces seem to
be created equal. I would look into one of the MIDISport interfaces
instead.

Also have you tried to run MIDI Ox on the PC? See if you can use that to
look at the incoming MIDI data stream on the PC, without using the Hog
software. That would help troubleshoot if it's a MIDI interface issue or
some communication issue between the interface and the hog software.

Lastly I assume you've checked things like cables and such? Making sure all
MID and USB cables are I good order.

Those are just the off the cuff things I could think of.


Richard B. Ingraham
RBI Computers and Audio
www.rbicompaudio.20m.com

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[Andy Leviss]

On Tue, Aug 7, 2012 at 11:33 PM, Jeffrey Yue <xpan...@gmail.com> wrote:
>
> Does bus-powered Midi interface has issues with MTC, specifically Uno? I
> did manage to get it to work, only once, throughout my series of tests.

In extensive testing on my own and via clients (as my day gig, I'm the
computer tech for one of the major Broadway rental houses), the only
interfaces we've found to reliably do MTC are the Edirol UM series.
Alas, most of these are discontinued, but the UM-ONE is still
available, and Edirol says it uses the same drivers and firmware base
as the other UM units did.

--Andy

[Charlie Richmond]

I have a UM-1X which could be sold if someone really needs it fast...

Charlie