moloxbat Posted May 6, 2012 Report Share Posted May 6, 2012 I am running Windows 7 And playing/recording synths, like Roland Alpha Juno, Oberheim, etc. via Midi I have a MOTU micro Express which is USB1 I believe Also I got a RME Multiface with a Midi Port. Connected to PCI I measured IN and OUT midi latency and have 5ms in and 5ms out on the MOTU On the RME it's zero ms, from zero to 1ms adding IN+OUT I know this might not be related to Midiboxes (maybe also?) but here are the people with expertise. So, can anyone state what it is about? Am I beeing fussy? 5ms-10ms ain't that much, but it add's up with another 10ms audio latency. Would there be a good option to USB Midi Interfaces, like old-school serial? Or is only my MOTU effected from that problem? Is it the OS even? some insight on this topic would be greatly appreciated. moloxbat Quote Link to comment Share on other sites More sharing options...
Altitude Posted May 6, 2012 Report Share Posted May 6, 2012 (edited) Its a combination of USB, host, shitty drivers on sub-par hardware. I did some studies when I had a number of different interfaces to test with a Core8 as a measurement device and here are the results: (TS= Timestamp on, DS= Directsound) The RAW is a physical connection from in to out (which should be the length of the midi msg), the midiox test is a basic software loopback You can see how much everything changes with the host as well as the driver. Most interesting though is how the Midex (which was a $450 interface at one time) degrades with more data and how the whole "LTB" (timestamping) is utter bullshit Edited May 6, 2012 by Altitude Quote Link to comment Share on other sites More sharing options...
moloxbat Posted May 9, 2012 Author Report Share Posted May 9, 2012 Thanks for shedding some light on the topic! (...and very thorough measurement) The GM5 seems to do a good job, special. not spreading so much. I am just wondering if my (not finished yet) SeqLiteV4 can act as a Midi interface with the same performance... Sonar is crap in that regard then, I am using FLSTUD and that needs to be checked For future measurem, how do you get to microseconds? what's the math behind that? Quote Link to comment Share on other sites More sharing options...
Altitude Posted May 9, 2012 Report Share Posted May 9, 2012 (edited) its milliseconds btw, its in the readme in the midi benchmark app folder and here: Edited May 9, 2012 by Altitude Quote Link to comment Share on other sites More sharing options...
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