Hello there!

I'm trying to create a theremin-like patch in pd which should be controlled with mouse. Y axis replaces the volume antenna and X axis replaces the pitch antenna. The first idea is to have four octaves range with equal distances (equal number of pixels) between each octave. For example:
mouse = 0 ... 110 Hz
mouse = 400 ... 220 Hz
mouse = 800 ... 440 Hz
mouse = 1200 ... 880 Hz
mouse = 1600 ... 1760 Hz
I'm stuck with scaling the x axis values, probably because I'm not good in mathematics. Any advice, link, or help will be well appreciated.
Thank you!
sinewave.

An easy way to do this in Pd without much math is to just scale the pixels to MIDI notes and feed them into a [mtof]:

[inlet] <-- x coordinate
|
[expr $f1 / 400 * 12] <-- scale 0-400 to 0-12
|
[+ 45] <-- offset by 45 (MIDI 45=110Hz)
|
[mtof]

Thanks, Maelstorm!
I tried to avoid [mtof] from the beginning because I thought that it will accept integers only and consequentially the glissando parts could sound too grainy, but I was wrong. If I don't make extremely fast movements with the mouse, it sounds ok. BTW, is there a way to get a view inside the pd objects, just to see how they work?

sinewave

You can download the source code:

http://puredata.info/downloads