[Possibly goofy idea...]

[M.Ruberto]

what would be an interesting project in addition to this, although much more
complex, would be a keyboard (possibly touch) where each key plays a sequence
while you hold it down. i was thinking it could be done using a dual 8 channel
multiplex device for each pair of keys. the 8 ch. multiplex device has a 3 bit
address which consists of simply sending it the binary # of the channel you
want to close. this would make it very simple to incorporate such functions as
backward/forward and random note sequence playback. all output CVs could be
summed for control of a single VCO or VCF in addition to having normalled
jacks for each channel/key for control of several modules. 8 channels per key
would mean quite a large # of pots and circuitry so i don't think this would
be reasonable for a full keyboard but with good design an 8 key controller is
concievable. also, the cost involved in buying 4 multiplexers and 64 pots
might be prohibitive to some. i guess the inspiration for this comes from
recently playing with my friends Serge. actually, it just might be illegal to
have the amount of fun this sort of device would permit 8-)

-<mike>-


Scott Gravenhorst <chordman at flash.net> wrote:
> I haven't seen this one (but that doesn't mean it doesn't exist)...
> 
> One of my favorite things to do with my FatMan is to hold down
> a key to play a constant pitch and fiddle with the filter cutoff
> freq knob with rez at max.  One can "select" harmonics.  What I
> would like to do is to build a very simple device that has 5 to 8
> micro switches (perhaps a salvaged keyboard).  These switches
> would conduct to a common point, a DC signal from the wiper of a 
> pot wired as a voltage divider supplying 0v to max CV.  The CV 
> seen at the common point is supplied as the filter's cutoff freq 
> CV.  Each key could be "tuned" by pressing it and adjusting it's 
> pot.  A sort of human clocked and human programmed analog 
> sequencer.  I would think I could then "play" these harmonics.  
> The control voltage output of this could probably be used other 
> ways as well.
> 
> In the real circuit, I'd probably use analogue switches, controlled by
> the physical switches.
> 
> Does this sound useful to anyone else?
> 
> -- Scott Gravenhorst
> -- Linux Rex, Linux Vobiscum  |  RedWebMail by RedStarWare
> -- FatMan: www.teklab.com/~chordman
> -- NonFatMan: members.xoom.com/_XMCM/chordman/index.html
> -- The 21st century does NOT start in the year 2000!!!
> 
> 


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