2 Sep
2018
2 Sep
'18
4:15 p.m.
On Sun, 2018-09-02 at 07:26 -0400, Paul Davis wrote:
On Sun, Sep 2, 2018 at 3:02 AM, Will J Godfrey
<WillGodfrey(a)musically.me.uk> wrote:
Such an issue could be related to the used opto-coupler and diode or by
a trim potentiometer for sensitivity that isn't set up properly. I
adjusted the trim potentiometer of my DIY MIDI throu box build in the
80s to work with old gear, but nowadays USB devices not always provide
enough current to drive the MIDI throu box with this adjustment. I heard
of issues related of slow opto-couplers or diodes to fix slope issues,
but never experienced this myself.
As a matter or interest, the only time I've
had missing noteoffs with
standard MIDI was when I had only a single MIDI port, and daisy-chained a sound
canvas and two keyboards (both sending active sensing). One for the
keyboards also had a pedal attached. Having said that I always used good quality
short cables.
a couple of days ago, while working on MIDI Clock support in ardour, i
was trying to figure out the origin of some missing Clock (0xf8)
messages. they would arrive every 830 samples plus or minus about 30
samples,. but every once in a while, the gap would be twice that.
long story cut short: just changing from using my MOTU Ultralite AVB
for MIDI I/O to a Midisport 2x2 fixed the problem. No more missing
Clock messages.
could be relevant to stories like the one above. there's no good
reason for this, but it is how things are.