3 Nov
2002
3 Nov
'02
11:58 a.m.
Hi,
I meant of sending midi events from the master keyboard via USB to the PC
which runs an internal soft-synth/sampler.
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.
-----
--
http://linuxsampler.sourceforge.net
Building a professional grade software sampler for Linux.
Please help us designing and developing it.
3 Nov
3 Nov
3:39 p.m.
New subject: [linux-audio-dev] Interesting USB MIDI master keyboards, do they work with Linux ?
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. 
4:17 p.m.
New subject: [linux-audio-dev] Interesting USB MIDI master keyboards, do they work with Linux ?
Fernando Pablo Lopez-Lezcano wrote:
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.
there's a difference though: the usb 1 ms is jitter, there's no way
to reconstruct the original timing. this in contrast to midi, where
you can extrapolate the exact event time quite well (provided you're
looking at a stream of mostly isolated events). oh well, most people
think 1 ms is below human perception limits anyway.
tim
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2 comments
3 participants
participants (3)
-
Benno Senoner -
Fernando Pablo Lopez-Lezcano -
Tim Goetze