This is my first instructable.... ever. So here it goes.

I own a Kaossilator 2 (KO2). It's fun little phrase synthesizer and simple looper. But it has this awkward issue with mic button. When you want to record something from microphone you have to hold down two buttons simultaneously. First the mic button to enable built-in microphone or external input (mic in) and second the loop recording bank button. This isn't an issue until you want to connect another instrument to it and record a loop. While holding down two buttons you have only one hand free to express your self as best as you can.

Imagine that mic enable button is toggle switch. You could enable external input and hold down bank button with your foot and have both hands free. We are now one step closer to our goal. But you still need to put KO2 on the floor, record a loop and then pick it back up. This calls for an foot switch which I'll be making in my second instructable.

Since Korg is reluctant to incorporate mic input toggle functionality in software update this could be solved with a little hardware hack. There are many ways to latch a push button. It can be done with transistor circuit, logic gates, NE555 timer or an microcontroller (MCU) and probably some other ways too. My favorite is MCU since it uses least amount of components and can be soldered directly on KO2s PCB.

Step 1: Look inside

First off let's see what we are dealing with.
We see a nicely exposed signal line from SW7 to some resistors. This is a signal path of our mic button. Since there are no other components in the way we can just break the line and solder our MCU directly on the board.
Next thing to consider is that big black chip. Finding out functionality of its pins is important for tracing out the circuit. In our case the only pin that concerns us is Vdd 3.3V power line for our MCU.
Link to CY8C3244AXI-153 PSoC: http://www.cypress.com/?mpn=CY8C3244AXI-153
In datasheet we see that closest Vdd pins to our line are 26 and 100. And GND is everywhere. Entire mesh is GND.
So now we know where all of the signals that concern us are located.
<p>Good information here. FYI: I picked up a broken KO2 which needs a new tactile switch for the INPUT (SW7) in the photos. After some investigation, I think it is part AMPTCFVTR from APEM (apem.com). Now trying to get a free sample from them, as DigiKey and Mouser do not stock this part for small quantity orders.</p>
<p>Hi I just wanna ask: Is there same problem with KP 2 mini? Or have KORG made mic input toggle functionality in software of KP 2mini? Thx</p>
<p>hello, this is what i am looking for and I am tired of the rubberband !. I just wonder if there is a simple way, rather than fidling around with programming a chip, cutting the pcb and what not. like replacing the existing button &quot;push on / release off&quot; with a &quot;push on / push off&quot; switch. in my thinking this should work. please confirm and i start looking for a right sized button to exchange : ) thank you.</p>
<p>Hi, Sorry for the late reply. Now I see <br>how I over complicated this rather banal modification, but I like <br>working with things that are laying around in my workshop =)</p><p>So <br>for simpler modification I would suggest buying a latching switch and a <br>stomp box. Just remove the old switch solder in some wires and connect <br>to effects pedal box. That's what I did for my effects pedal box with two switches for <br>loop banks. Details about that are coming soon in part two of this <br>&quot;hack&quot;.</p>
Sorry, for the delay, I did see your answer before!! <br>Well, the problem I have, using power supply 4,5 Vdclain or AA 3Vdc, sometimes power on, sometimes not power on. <br>Sometimes all leds are power on, but don't work anything. <br>I can make a video to explain better if is necessary. <br>Some ideia?
Sorry, can't help you here. I would have to have the unit in my hands to make some measurements. You don't have any warranty on the product? Try some electronics forum. I've seen lots of guys helping out on EEVblog forum: http://www.eevblog.com/forum
hello, realy nice your job here!! <br>I would like to do this on mine, but mine does not work very well, reading yous datasheets, I figure out that the problem Ia have can be fix. Give your idea if is possible. <br>About LTC3101, nobody can fix here in Brazil, maybe I can do a reset, but I have no experience with that. If you want to share your knowledges, please I would apreciate. <br>See you <br>
If you could describe your problem in a bit more detail and make some measurements around DC-DC converter if you believe that is the source of your KO2s problems maybe someone could help.

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