Casio CZ/ VZ/ FZ - Pro Series

It still doesn't make any sense to me, but I was willing to design some tests to see what results I can get with my E-Mu 2x2 usb-midi interface.  The most extreme test I could think of is this:

1. Run my arduino midi program into the usb port on a Win 7 laptop using the hairless usb-midi bridge.
2. Send the arduino's midi data out the E-Mu 2x2 usb interface to the CZ-5000.

One snag >>might<< explain why slowing down the midi stream seems to work.  See below.

I can set the arduino and usb-midi bridge to 115200, 57600, 38400, and 19200 to see if the E-Mu 2x2 can successfully receive the midi data from the arduino and then retransmit it to the CZ. If not, I'd take this as evidence that the problem is not that modern computers have faster CPUs that computers did in the 1980s, but it is a matter of serial communication rate differences.

For a second test, I can try sending a patch request command and waiting for the patch dump. I know it worked using midi-ox on a Win XP PC, but that's a 32-bit system. Perhaps there's something about Win7 and/or an 64-bit OS that would cause a problem. 

I can imagine two results: either test 2 will succeed or it won't. If it does, that should put to rest the CPU speed differential (between modern computers and older computers) as the cause of the problem. If test 2 doesn't, I can try putting in some sort of delay. Unfortunately, that will neither prove nor disprove that the problem is caused by the CPU speed differential between modern and older computers. So far as I can tell, it could be any of a number of other causes.

(Not sure when I will be able to run these tests, but I am interested to see what the results are.)

Steve

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"Can I use the native MIDI baud rate, 31250bps?

It would be nice to be able to use the hardware MIDI baud rate, 31250bps. This means the logical signals from Hairless Bridge can be used with real MIDI hardware, with just some electronics to adjust the serial voltages to become MIDI current loop signals.

Unfortunately, most computer serial ports can't actually talk at 31250bps. For historical & technical reasons they're usually limited to multiples of 300bps.

However, if you're prepared to hack around a bit, the FTDI USB/Serial chip (as found on the Arduino Duemilanove) can talk the native MIDI rate. Have a read through these Arduino forum posts and you can see how to hack the driver on OS X or Windows, so that when you choose a different rate (like 38400bps) it is actually 31250, behind the scenes.

This is not a supported configuration for Hairless Bridge, but it can be made to work in some circumstances." 



--- In CZsynth@yahoogroups.com, analogmonster@... wrote:
>
> His reasoning makes a lot of sense actually. 

[snip]