Hi,

I encounter a problem while trying to control PD patch with midi.
I am very bad in math and I have no idea how to map 0 - 127 of midi value to -1 to 1 for my synth's pan.

In Max/Msp, or SC, I remember that they have an object called [map] or something.(in SC, .linlin method)
It usually takes four arguments, like (0, 127, -1, 1). then the object will automatically map first two arguments to second two arguments range.

Does PD has this kind of object?
Or I should do all in math? (combination of division, multiplying...etc.)

I wish that there's something...

thank you.

ok, I've found [scale] object but the problem is that I can't use GEM.
is there any other way to use Gem and also have an object like [scale]??

the maths:

• divide by the total number (127) - gets you a scale between 0 and 1.

• multiply by 2 - because you need you need to scale it into the range of 3. (now you have 0, 1 and 2)

• subtract 1 - bring that scale back into the range of -1, 0, 1.

thanks