The Yamaha AN1x Synthesizer mailing list

Umm , currently my Roland SMPU64 (4*4) - USB seems to be working fully fine with
AN-1x (and AN-1x Editor too).
Win ME , VIA chipset ASUS board , PIII  ... all the Windows Updates installed
(important).
Ray.

Gary Gregson wrote:

> Paul,
>
> My understanding is that its not a case of bandwidth (MIDI only needs
> 31.25KBits/s)...its a case of the underlying protocol used to deliver the
> data. Both Serial and Parallel interfaces have handshake protocols
> (implemented in hardware). This means if you try to overrun the receiving
> device it can hold off further transmission until its ready.
>
> Many USB MIDI devices appear to operate on a 'fire and forget' scheme...they
> expect the receiver always to be in a state where it is ready to accept
> data. However, in the case of USB MIDI there is a step transition of
> bandwidth. ie. at some point you have to go from the 100Mbps of USB, to the
> 31.25KBits/s of MIDI. Unless the interface designers have done some clever
> stuff, this can cause big problems.
>
> Typically I have found most USB devices work fine for simple MIDI
> playback/record. However when you start putting heavy demands on
> them...particularly involving large amounts of sysex....then problems occur.
> The net result is often that data is lost due to receiver overrun (or other
> glitches).
>
> The An1x uses big sysex packets for transferring patch data and is very
> sensitive to the packet timing. Consequently it tends to show up problems in
> USB interfaces:-(
>
> Perhaps if people with working USB interfaces (that can reliably bulk dump
> AN1x data to/form the computer) would care to post a message...then we could
> weed out the good ones from the bad.
>
> Regards
>
> Gary
> Email:
>      gary@...
>      http://www.yme.co.uk/yme
>
> -----Original Message-----
> From: dkblade@... [mailto:dkblade@...]
> Sent: 15 February 2001 10:18
> To: AN1x-list@yahoogroups.com
> Subject: [AN1x-list] Re: MIDI Interfaces - avoid USB?
>
> Hey there,
>
> I really don't see how the interface between the PC and the MIDI port
> could make a difference. USB supports over 100Mbps transfer rate,
> compared to 112Kbps of serial and 5Mbps of parallel. Er...greater
> bandwith = higher timing resolutions possible = more accurate. But
> it's besides the point. The timing is determined by either your
> sequencing software or your master midi clock, not by interface.
>
> The only reason not to get USB midi port is possible
> incompatibilities with software, but mine works great :)
>
> Cheers,
>
> Paul Kabzinski
>
>
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--
http://www.mp3.com/raymaxer - full tracks and CD !
http://www.ampcast.com/raymaxer - short snippets of the tracks !