7 Oct
2009
7 Oct
'09
9:45 a.m.
On Tue, 2009-10-06 at 17:30 +0200, Nick Copeland wrote:
Out of interest, what was the problem with MIDI
sequencing and SYSEX?
The only problem I knew about was that they are atomic and cannot be
interupted hence on 'legacy' 5-pin DIN at a meagre few kilobaud there
were timing issues, largely overcome now with USB unless you want to
download gigasamples.
For a given interface, you cannot send more midi-data down an USB line
than would fit in legacy midi, so the bottleneck still persists.
Otherwise you'd have created a standard that would overflow any
midi-endpoint connecting to the "real" world.
What you can do is to have up to 16 midi-endpoints (real or virtual
5-pin DIN) for each device in both directions.
If you know that the device is virtual and that it won't pass on any
messages to the next device, you can sometimes get away with sending
usb-midi at a higher rate. This has to be implemented at the driver
level though. FWIW, I had something like that going for a while on a
BCR2000 for subtle (fast switching) glow-in-the-dark effects as well as
flashing blinkenlights, using parameter feedback.