Emu XL-7 & MP-7 User's Group

Hi Aaron,
I wasn't creating a MIDI loop. At least not intentionally.
I took great care that every kind of MIDI message (except
realtime) is properly routed and doesn't get back to XL7.
My MIDI interface/patchbay is an Emagic AMT-8.
I had to merge the MIDI In to Out because in the mentioned
case I wanted to tweak parameters on a Waldorf Pulse (CC50
as Cutoff) while recording movements in XL7, using a
Waldorf XTk as masterkeyboard (CC assignments same as on
the Pulse where applicable). Since CC33-63 is nonexistent
on the XL7 this was the only solution.

Anyway, since I can overcome the problem is no big deal
but I assumed realtime messages are handled correctly (for
example, after an initial MIDI start following start msgs
are discared until a stop message received/transmitted).

Regards:
      Zsolt



> Von: Aaron Eppolito <synthesis77@...>
> An: xl7@yahoogroups.com
> Betreff: Re: [xl7] (not) a nasty bug
> Datum: Wed, 21 Dec 2005 20:24:47 -0800 (PST)
> 
> So wait, creating an intentional MIDI loop is a bug in the XL-7? 
> Hardly!  If you create a MIDI loop, every single product on the market
> will do MIDI loop things.  If there is a bug (other than in your setup)
> it's the fact that MOTU (I'm presuming that's what you have) patchbays
> don't route realtime messages, they multicast them.  It's intentional
> on their part, but it's really annoying.
> 
> Anyway, the solution is don't merge in to out, and filter reception of
> start/stop on devices you don't want to recieve it.
> 
> Happy holidays,
>   -Aaron
> 
> --- Zsolt Szabo <Zsolt.Szabo@...> wrote:
> 
> > Hi !
> > 
> > XL7, OS 2.0.
> > Connect both in/out to a MIDI interface or patchbay which doesn't
> > have
> > the MIDI realtime msgs filtered. Enable "Merge MIDI In to Out" on the
> > XL7, it doesn't matter which out port, A or B which is even more
> > weird
> > than what happens next. Start XL7 by pressing PLAY. Now XL7 will
> > nicely
> > transmit MIDI Start message. If the MIDI interface transmits it back
> > to
> > the XL7's MIDI In port a nasty MIDI loop will occur which will kill
> > the
> > XL7 in approx. 10 seconds. Complete freeze. If you are quick enough
> > to
> > pull the cable the XL7 is able to cope with it (buffer size big
> > enough
> > to hold approx. 8-10 seconds worth of MIDI msgs ?)
> > 
> > 100% percent reproduceable.
> > Workaround - filter the outgoing MIDI realtime on the MIDI
> > interface/patchbay towards the XL7's MIDI In. Keep an eye on
> > it in live situations - I learnt it the hard way ...
> > 
> > Regards:
> >      Zsolt
> 
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