pot 10k Log instead of 10k Lin for CHAOS MAtrix

[xarolium]

Dear Midiboxer,

I just buy a Matrix 1000 and i would like to built a Chaos Matrix

I have a big stock of 10k Log Potentiometer and i would like to know if it's possible to change the AIN response to match with 10k Log instead of 10k Lin potentiometer

Thank you,

Xarolium

[jojjelito]

Hmm, you could build an exponential converter using a transistor, or add/change some conversion curve in the software. The software method will yield awful results due to loss of precision, unless you sample each pot with 10-12 bits and then convert to 7-8 bits using a lookup table.

The easy way out - get proper linear pots. It will be painful, but the other way of sampling log pots (sans correction) will feel weird as first you turn and nothing happens, then everything happens at once (or vice versa depending on how you mount and wire the pots). The software correction method is an overhead in terms of the table size or if you use interpolation.

Edit: Here's some nice reading to get you started on some ideas.

Cheers,

J

Edited August 25, 2011 by jojjelito

[xarolium]

Ok

i think i'll buy some 10k potentiometer it would be the easiest solution

thank you for your help