[PD] newbie MIDI control questions

matthew jones M.Jones at signal.qinetiq.com
Wed Oct 22 12:04:28 CEST 2003

I find that the best way to think of scaling is to think of it as a linear
mapping (see attached bmp)...

then you just work out the scale factor of the mapping, ie (range 2)/(range
{or ((max 2)-(min 2))/((max 1)-(min 1)) }

and then the offset.  linear mapping is clearly the linear function y = mx
hence you've worked out m from the scale factor, and c from the offset.

BTW eric, I'll probably get those modified rhythm estimators to you soon,
just that my home pooter is absolutely up sh1t creek...




> good morning,
> instead of writing to an array, you can get the value of an audio signal
> more directly, and convert it to a control signal. see [snapshot~] or
> [avg~] and [unsig~] (which i think are in the zexy library)
> here's on idea on how you could go about it. it creates an sinewave LFO
> using [osc~] based on BPM, snaphost~'s it every 5 msecs, scales the
> value to something ctlout can use (0 - 127), and outputs it.
> you might want to check my math on the scaling. ugh. algebra. i should
> have paid more attention in junior high.
> and i thought i'd never say it. algebra serves a purpose? i guess you
> win this time, junior high school math teacher.
> --eric
> ------ http://USFamily.Net/info - Unlimited Internet - From
$8.99/mo! ------
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