Date:Thu, 16 Dec 1999 11:27:35 +0000
From:Dominic Robson <dominic_robson@BIGFOOT.COM>
Subject: Re: Talking Stick
We managed to find a series of long throw potentiometers, the sort of
things that are usedi think in position feedback for mechanical/hydraulic
systems. They vary up to about 1meter in throw and are usually long and
cylindrical with a central spindle that extends as the slider.
The drawback is that they are quite expensive in the $100's range but they
are100% robust and consistent. Having reliability at the sensor end of
things was pretty crucial for them to be used with confidence for a large
scale performance piece.
>wireless midi ?
tell us more, please !
we looked around at commercial wireless midi systems and i could only find
one that was made by midiman (?) and had been discontinued . This with the
popularity of midi surprised me and i suspect that there probably is other
stuff hiding out there. It seemed on a web surveyto be in the domain of
useres of yamaha style midi wind instrument controllers.
I was not heavily involved in the radio side of things but essentially a
PIC microcontroller converted the sensor information from the stick and
then formatted the information with some encoded error checking. This was
transmitted from the stick using readily commercially available local area
transmitter board modules and received at the Mac end by the matched
receiver. These boards may have been specific to digital use , i dont
recall. This fed to another PIC chip which did the appropriate error
checking and filtered out corrupted data and sent the rest out as midi
information that went straight to the Mac . The communication was only one
way. this system works well up torange of around 30m . In radio noisy
areas like Manhattan this could be less with a big increase in the number
of bad messages. we werent however ever using full midi bandwidth.
Date:Thu, 16 Dec 1999 08:47:23 -0800
From:"Michael P. Whyte" <matrix6k@YAHOO.COM>
Subject: Re: Midi Sync and Lib Scripts
I have gotten this to work:
I have max on the ibook and it starts oms timing, formatted to beat clock.
Oms timing starts Vision, also running on the ibook. (vision is set to internal
clock, and remote start is on so max can start it.)
Vision sends out midi sync to the desktop, running logic. Vision starts logic.
This wasn't easy. Oms timing will start sequencers at the bpm specified,
but I had a hard time locking a tempo object to the setclock object. (setclock
was oms timing in, or setclock "name" ext)
The tempo object was running way too fast. What I did was set the tempo object
to another setclock object, this time the setclock object was in multiplicative
mode. I set this clock to the other oms timing referenced clock, and put the
multiplication factor at .7228. This is accurate to one hundred measures or so,
and then starts to drift.
I'd like to find something better, any ideas are appreciated.
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