audioworld Posted April 11, 2007 Report Share Posted April 11, 2007 hi again,many answers to my desgin questions I found already in the archive, but not this one:I have a lot of logarithmic potis around (from the days where I wanted to build analog mixers..--))). I understand that for MB64 a linear curve is preferred, but is there a way to "scale" the values so i can use my logarihmic ones?thanks,kap. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted April 11, 2007 Report Share Posted April 11, 2007 Hi kap,In short: log pots won't work. Sorry! Quote Link to comment Share on other sites More sharing options...
audioworld Posted April 11, 2007 Author Report Share Posted April 11, 2007 stryd,thanks anyway, better to know it from the start...kap. Quote Link to comment Share on other sites More sharing options...
Wisefire Posted April 12, 2007 Report Share Posted April 12, 2007 sell them and buy linear pots Quote Link to comment Share on other sites More sharing options...
audioworld Posted April 12, 2007 Author Report Share Posted April 12, 2007 wisefire:like your name suggests, wise advice, thanks. Quote Link to comment Share on other sites More sharing options...
lylehaze Posted April 12, 2007 Report Share Posted April 12, 2007 I have not yet "been inside" the MB64 code, so please take this with caution.There is code in the MBMixer that will convert a 7 bit linear value into an 8 bit Log value, and also code to convert 8 bit Log curve back to _AN APPROXIMATION_ of a linear curve.The resolution is a bit grainy, especially at the low end of travel. It is sized only for 8 bit to 8 bit conversions, if you need something different you'd have to remake the look-up-table.To find it, get the archive here:http://www.midibox.org/dokuwiki/lib/exe/fetch.php?id=midiboxmixersoftware&cache=cache&media=mbmixerv1.zip(If that link doesn't work, it's in the WIKI at the end of the software page for the MBMixer)from the zip file get "logbyte.inc" and look inside for a function called "AntiLog" and it's data table, alogtable.Having said all that, it's not the "right" way to go. Your MB64 will be different from everyone elses, and if it doesn't work "just right", you'll be on your own. I agree that using the right parts is the best way to go.Good Luck,LyleHaze Quote Link to comment Share on other sites More sharing options...
audioworld Posted April 12, 2007 Author Report Share Posted April 12, 2007 lyle,thanks, I agree that such a mod would stray away from the mainstream too much... I have a lot to learn already, so I will invest in new pots to get rid of even more problems to think about..---)))))kap. Quote Link to comment Share on other sites More sharing options...
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