[linux-audio-dev] Interesting USB MIDI master keyboards, do they work with Linux ?

Fernando Pablo Lopez-Lezcano nando at ccrma.Stanford.EDU
Sun Nov 3 14:40:01 UTC 2002

> I meant of sending midi events from the master keyboard via USB to the
> PC which runs an internal soft-synth/sampler. 

Sorry, I misunderstood. You are right, if the keyboard is connected
through usb big chords will have much better timing. The 1msec added
latency should not make any difference at all when compared to normal
midi. One midi note (no running status) takes about 1msec to be
transmitted at 31250 baud. 

-- Fernando

> In that case USB should improve timing because of the bigger bandwidth,
> (but will add 1msec of latency due to USB1 polling mechanism as far as I can
> understand). Correct me if I'm wrong.
> cheers,
> Benno
> You wrote:
> -----
> > Ok if the Edirol keyboards support standard MIDI then there shouldn't be any 
> > problems using them under Linux, but since USB has a much bigger bandwidth 
> > than serial MIDI, I that the timing for notes that belong to large chords is 
> > more precise. Can someone confirm this ? 
> Not really, unless you are spreading those chords on several separate midi 
> outputs. If it just one, then it determines the bandwidth available. 
> Getting things faster to the interface will do nothing because it still 
> has to send the bytes to the external synth at the same old slow 31250 
> baud speed. 

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