Analogue-sequencer

> Using the stalwart sequencer Studio Vision Pro, I have had better results 
> than from slowing tempo as the midifile plays, by lengthening of time between 
> sysex events (data strings).
> [...]
> I have no idea why this is,

The only reason I can think of is if the sequencer is also putting out
beat clock.

If I recall correctly (it's been many years since I looked at this
stuff), the MIDI specification allows realtime bytes to be embedded
inside other MIDI messages, including sysex. I don't know whether any
sequencers actually do this, and if they do, I don't know how many
devices would deal with the data properly.

But since you suggest that *increasing* the tempo makes things more
reliable, this is probably a red herring, although I'd still point the
finger at handling of beat clock. A sysex message is (realtime bytes
aside) an atomic piece of data, so if these are being transmitted (or
queued for transmission via some MIDI driver) with a particular
spacing, the underlying beat tempo should be irrelevant.

In other words: I dunno.

-- 

  nick rothwell -- composition, systems, performance -- http://www.cassiel.com