Anafrog

Demo of the Korg MS-10 with a modified MG range, I installled a switch just above the wheel that switches between standard and fast MG rate. The new setting allows the MG (LFO) to go from slightly faster than normal to into audio rate, this allows for a huge amount of new sounds to be created with the synth.

The clip starts with the MG rate set to control the filter at low, then about a quarter then half, etc round to full with the range switch set on normal, then this is repeated but with the switch set to the new extended range. The same again but with the MG set to control the oscillator. Further twiddling ensues, then a sequence with various settings to demonstrate some of the FM effects possible.

Here's how it's done:

Basically it involves removing C34 (1uf), running 2 wires (long enough to allow the switch to be mounted where you want it) from the holes left by it, then get a small toggle switch (on-on type, 3 contacts) solder a leg from C34 to one side of the switch, a leg from a 2.2uf to the other side, the remaining leg of each cap is then soldered together and to one of the wires, the other wire goes to the common (centre) of the switch, there is plenty of room for the switch to be placed above the wheel if you use a small enough toggle.

You can try different values of capacitor for slower or faster times but I found a 2.2uf gave a decent range, another good idea would be to use a 3 way switch with a low/normal/high setting.

another good idea would be to use a 3 way switch with a low/normal/high setting

According to the description, C34 is now switchable between 1uF (original cap) and 2.2uF (new cap). That would give a choice between the original range and a lower(!) range. Not any audio range.
Was the 1uF cap in fact exchanged for something else? I'd expect it to be replaced by 0.1uF or smaller, to raise the range with a factor 10 or more.
(I'm not sure how high it goes in the original, though, but hundreds of Hz should be the goal.)
Or did I misunderstand things? :-)

I modified my MS10 as well. I recommend using two 1uF capacitors in parallel (2uF) for the low range and a .47uF capacitor for the high range. Now it goes from slower than stock up into the audio range for some great new sounds. Using these component values, there is a complete overlap with the stock LFO frequency range as well.