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Sysex is a little different to note on/off data in that the length of a sysex music is not known (until the sysex message comes to an end). This means that merging is a difficult process since local messages would need to be paused until the sysex message is complete. So there needs to be buffering of the local messages until the sysex is complete. Also the end of the sysex message may be hidden amoung data so the merger may have problems in the merging.

The E-MU command module may avoid the problem by ditching sysex. Alternatively the sysex messages may be corrupted in the merge (due to problems stated above). It is also possible that some messages which are on the command station's MIDI channel are presumed to be for the command station and not merged. This last option seems unlikely since the notes are passed through.

Interestingly, turning a knob may not generate sysex messages if its configured as merely a controller. Controller change messages are simple 3 byte messages as note on messages.

Again I don't use the XL7 enough to check this out.

What you might like to do is run something like midi ox on a PC to capture the keyboard output with and without an XL7 in the way to see if the messages are in fact being filtered out.

From: lz303
To: xl7@yahoogroups.com
Sent: Sat, April 17, 2010 1:47:09 AM
Subject: [xl7] Re: Sysex through? XL7 filters Sysex messages?

Hmmm...sorry to disappoint you but in my case it is definately not working. I tried both Midi outs (A+B) , i changed every possible parameter in the midi menu (eg midi merge, both 'on').

Sysex is definately filtered out or ignored or something else.

Like i said before:

Masterkeyboard which sends sysex commands to control cutoff freq and resonance and so on ... to Alpha juno directly or even through a Korg KMS30 works perfect. Every sysex command works.

Masterkeyboard to XL7 then through either midi port A or B out...i can play notes, i mean the Alpha juno plays as i t should but the sysex commands are not functioning anymore. No reaction when i turn a knob...

--- In xl7@yahoogroups. com, Jack Pratt wrote:
>
> That's good to know.
>
> As I mentioned I don't use my XL7 enough. E-MU did put lots of effort into these modules so its not surprising that they can do what most devices wouldn't be capable of.
>
> Thanks!
>
>
>
>
> ____________ _________ _________ __
> From: Narcissus
> To: xl7@yahoogroups. com
> Sent: Fri, April 16, 2010 6:11:08 PM
> Subject: Re: [xl7] Re: Sysex through? XL7 filters Sysex messages?
>
>
> In fact, the Command Station IS a MIDI Merger. If you activate (in the MIDI Menu) the "merge midi in to out" you can even choose which of the 2 midi outs carries the mix of incoming data and sequenced one. The CS shouldn't filter anything, even sysex, when one if its outputs is used as a MIDI THRU.
>
> No keyboard sporting a MIDI THRU would do it, and it would be a terrible flaw in the design
>

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

Re: [xl7] Re: Sysex through? XL7 filters Sysex messages?

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