Well it seems that manufacturers are still
making MIDI devices with incomplete or broken SysEx support.
I like the Alesis cable. I especially like that all the electronics are contained within the USB plug and that no drivers are required. But that looks to also be its Achilles heel as it looks like the on-board driver is simply broken when it comes to SysEx and it cannot be upgraded.
There's very little about it online, but I did find a couple people complaining about its SysEx support, so at least we're not the only ones:http://en.audiofanzine.com/midi-interface/alesis/USB-MIDI-Cable/user_reviews/r.41273.htmlhttp://www.gearslutz.com/board/electronic-music-instruments-electronic-music-production/483189-midi-interface-recommendation-needed.html
My suspicion, after playing with some low-level code, is that it is transmitting the data at a rate that is too high for the Zendrum to accept. There's not a damn thing we can do about that though. That it works in MIDI-OX is a mystery. But considering the size and age of that program I suspect they have written their own low-level code for transmitting SysEx whereas I'm relying on the modern Windows multimedia subsystem (API).
If you're looking for a similar product that does
work with the Zendrum and ZenEdit, then I suggest the M-Audio USB Uno. It's been around awhile and the latest drivers are 100% compatible: http://tinyurl.com/8f9l5j8
I'm going to update the support page on the ZenEdit site to show which interfaces are known to be compatible and which are definitely not.