Casio CZ/ VZ/ FZ - Pro Series

you could fit a lan midi port on the cz this is attached to the pre opto isolaters of the uart

then you can use midi over lan

but the midi protocol is still 31.25kb period thats the standard set

but the problem lies with the usb and windows changing it from win98 

and since then midi timing has been sloppy

now a parallel interface is much better and timing is much better 

so a opcode x64 which i still use and has xp 32 and 64bit drivers 

and i have never had any problems with sysex 

but i still use sound diver and changeit which is a great sysex sender and has a section for slowing down packets 
  ----- Original Message ----- 
  From: Lee Borrell 
  To: CZsynth@yahoogroups.com 
  Sent: Thursday, August 22, 2013 12:47 PM
  Subject: Re: [CZsynth] Speed of sysex transfer


    
  I think if you talking about USB to USB transfer - or Firewire then you may have a point ,but as soon as any interface hits a MIDI DIN plug it HAS to be 31.25 Kb - this is the MIDI standard. No commercial interface with DIN plugs on it is going to do better than that baud rate,or face the equipment not getting the signal. In the case of pre-USB vintage machines,there is no way to go faster than 31.25kB.

  ________________________________
  From: fulfil_objective <robot@kasploosh.com>
  To: CZsynth@yahoogroups.com 
  Sent: Thursday, 22 August 2013, 7:21
  Subject: [CZsynth] Speed of sysex transfer


    
  Hi Steve,

  I think you are too focused on these vintage numbers like 31250 bps and 115200 bps. Transferring sysex by USB and MIDI are not limited to these old numbers. USB enables speeds that are hundreds or thousands of times faster than these numbers. In fact, greatly higher speeds are touted as one of the benefits of a USB MIDI device (along with multiple streams).

  High speed sysex transfer is both desired and encouraged, for example, in the case of sending sound data to a sampler. If you wanted to send 128 megabytes of sounds to your sampler, and if you were restricted to 31250 bps, it would take 9.5 hours to send the sounds. USB MIDI devices enable higher speeds, and that speed is encouraged.

  31250 bps is the speed of an old dialup modem (actual throughput) on a good day. If you tested at 115200 bps, that is merely 3.7 times faster than 31250 bps. Still very slow by today's standards.

  USB 2.0 has a max throughput of something like 35 MB/s. But lets be generous and say that in the real world, you can only get your USB 2.0 to 20 MB/s. That speed, 20 MB/s, works out to 160,000,000 bps, which is 5,120 times faster than 31250 bps.

  So yes, I think a capable modern computer with a good USB system can send sysex out faster than the CZ can deal with it. And it's not necessarily tied to CPU speed of the computer either, more like the speed of the whole computer-USB system.

  You will probably find it enlightening to read the "Universal Serial Bus Device Class Definition for MIDI Devices", Release 1.0, Nov 1, 1999, which you cand download here:

  http://www.usb.org/developers/devclass_docs/midi10.pdf

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