geoff wrote: > On Tue, 05 Jan 2010 21:27:32 -0700, Gustin Johnson > <[email protected]> wrote: > <snip> > >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> geoff wrote: >> >>> On Tue, 29 Dec 2009 18:49:16 +0000, geoff <[email protected]> wrote: >>> >>> >>>> Hi there, >>>> >>>> I seem to have a jitter issue with external MIDI timing. >>>> >>> Still stuck at ~30mS jitter. >>> >>> Booted with "hpet=force", and the kernel (and thus ALSA) found an >>> HPET, but the timing stayed the same. >>> >>> At Ralf's suggestion, I ran up Win XP Home SP2, installed the latest >>> MidiSport drivers, installed MIDI-OX and ran a loopback test. >>> >>> This relies on the accuracy of the MIDI-OX timestamping, but I seemed >>> to be getting a consistent 5mS round trip from the USB interface. >>> >>> Which seems to indicate there's a software level incompatibility with >>> USB MIDI (or at least, MidiSport USB MIDI) and 3.0b3. >>> >>> I'm looking for suggestions to ameliorate this situation. >>> >>> >> something like >> http://www.philrees.co.uk/products/thruunit.htm#v4 >> or >> http://www.philrees.co.uk/products/thruunit.htm#v8 >> >> I have never needed or used these sorts of things, but it may be useful >> for you. >> > > Thanks for the suggestion. > > I had a configuration similar to that in the early 90s. To prevent the > "drummer" sounding increasingly drunk as more (high controller > density) parts were added to the piece, I replaced it with a Unitor 8, > an eight port MIDI interface of the period. > > It doesn't take much stacking on a single MIDI cable to bring that > inebriation about, imho. Plus, you need a switch box for patch > editing, which is a pita. > > <snip> >
Any way, if you should decide to buy such a MIDI thru box, keep in mind, that it's easy to build one yourself, if you should be able to solder. >>> And can anyone describe their measured low-jitter external MIDI setup >>> with at least 4 ports, please? (where low is < 10mS) >>> >>> >> I have a total of 3 midi devices (a keyboard, BCF2000, and a synth). >> I use the 2 ports on my Hammerfall. I also have a midisport 2x2 that I >> have not used for years. If I get some time over the next couple of >> days I will run that midi test. >> > > Thanks for considering this. Cheers, Ralf _______________________________________________ 64studio-users mailing list [email protected] http://lists.64studio.com/mailman/listinfo/64studio-users
