29 Aug
2007
29 Aug
'07
8:20 p.m.
On Tue, 21 Aug 2007 16:55:03 -0700
Bob van der Poel <bob(a)mellowood.ca> wrote:
Nick Copeland wrote:
Sorry it's taken a while to get back to you, I've been on holiday.
I'm still trying to cope with the concept of a sunny August Bank
Holiday in Yorkshire!
I did some work on PLLs at RF mmmfty mmmf years ago and seem to remember
that they are only really effective if there is a large difference
between the controlled signal and the rate of change, which I wouldn't
have thought would be true in this case.
This actually, isn't really what I'm after anyway. I want to do what is
potentially much simpler, I want to manage a completed MIDI recording
rather than working on-the-fly.
I would imagine something like:
Create a table of all the user-supplied reference notes.
Extrapolate further reference notes.
Calculate a best-fit curve.
Use curve to adjust all events (not just note on/off) on all channels
for even timing.
Sounds simple doesn't it :)
... bet it's not!
--
Will J Godfrey
http://www.musically.me.uk
Hm, my reply to munging got damaged there!
Kurzweil developed a box to do this, I think as a project after selling
his company to Young Chang. It was just such a PLL that would sync to
the drummer so that the massively overproduced garange bands could play
their music live, something that was impossible without miming the
whole act. Basically the drummer would lead the tempo (some are
notoriously bad at following a set tempo anyway), from that the software
would derive a MIDI time code and away it went to drive the sequencers.
I remember, a long time ago, playing an Electrohome home organ which
varied the beat box tempo by following the timing the player used on the
pedalboard. I was young at the time (in the 60s) and I'm not sure how
well/badly it worked. But, I do remember the owner boasting about it :)