KVR Audio

itoa · Post by **itoa** » Mon May 25, 2015 4:19 pm

I use time = (10^x-1)*range for input 0-1 ... it turned out its bit "unnatural".
Is there any common exponential transform that feels more natural in the whole range?

BlitBit · Post by **BlitBit** » Mon May 25, 2015 5:28 pm

Hi itoa,

I found this blog series very helpful with regards to envelopes:
http://www.earlevel.com/main/2013/06/01 ... enerators/

I think your question is mainly answered in the second part.

itoa · Post by **itoa** » Mon May 25, 2015 6:32 pm

I was asking about a convenient slider - time value mapping. This article explains how envelopes work. Thanks anyway.

JCJR · Post by **JCJR** » Tue May 26, 2015 12:10 am

An interesting question. Never wrote any softsynths.

Is it known that envelope knobs or sliders follow exponential curve? Maybe old synth controls are sometimes linear potentiometers, though there were common tricks to make linear pots behave somewhat non-linear according to what fixed resistors are combined in a network surrounding the linear control.

Presuming the early generation EG's had satisfactory control feel, most of the early units were not sophisticated, voltage controlled or whatever-- Just physical variable resistors and assorted simple control logic steering the various variable resistors into some kind of integrator.

If you can snag a few antique synths for temp testing, you could set up simple patches and record the audio envelope of various knob/slider settings to derive a pragmatic map of the relationship of control position vs time, and sustain control position vs level?

itoa · Post by **itoa** » Tue May 26, 2015 6:07 am

The question is rather about exp sharpness and range

Tale · Post by **Tale** » Tue May 26, 2015 8:00 am

Maybe a simple x^2 or x^3? I dunno...

itoa · Post by **itoa** » Tue May 26, 2015 8:04 am

Common practices from synth creators

?

Most common formula for time parameter mapping for envelopes