Korg Forums

Hi Guys & Gals, long time no see.

When I scroll through the programs fast, the scroll seems to become inaccurate. When in Bank A for instance, I have to slow down the scrolling at A16 in order to get to B1, otherwise it repeats bankA. Same with swapping timbres, the scrolling seems to be defective.

Any answers for this?

Radias Version 2

Not sure exactly what causes this but it seems to be a hardware fault much like that which causes knob jitter and etc. obviously the alpha wheel operates a bit differently to a standard pot, but its usually down to contacts.

Mine seems to have improved lately, and I haven't done anything, however I believe the issue has come up on the forum before. I can't really tell you exactly what to do about it but if you know anyone familiar with electronics or you know a keyboard or hardware specialist near you they may be able to give you some pointers.

I've seen this happen on mine, but only when it is really cold.

Hi all, I know this is an old thread, but I've just discovered this exact same problem with my Radias. It also happens if scrolling fast with the 'big knob' for any parameters - it jumps back about 10 or 15 and then continues, interestingly only when scrolling 'up'. Has anyone solved this problem? Should I try reinstalling the V2 OS, or trying a bit of pot cleaner, or something else (I've also only noticed this happening since I moved the Radias down into the basement, which is a couple of degrees colder than the rest of the house!)?

Thanks for any advice.

This is a common problem with endless encoders. They are build in differnent forms, optical or mechanical with binary, bcd or pulse train output (two phase shifted pulses to detect in which direction the wheel is rotating).
Those pulse trains are usually scanned, polled or whatever else by the main processor (besides all the other controls and keys) and therefore there is a maximum posible "sample frequency" of them which indeed is not very high. If you turn the dial faster than this, there will be a loss of information and this could even be interpreted as turning in the wrong direction. This effect also could be seen on western movies where the wheels of the horse wagons seem to turn in reverse when they are slowing down or changing the speed in relation to the FPS of the movie. I have such an encoder on my sound system, and if I want turn the volume down very fast, it increases it instead, which is very nasty at late night

This effect could be more pronounced at temperature changes, dust or bad contacts. The best solution besides cleanig is to turn the dial a bit slower.

Thanks axxim - very interesting reply!