Hello,
I just went out and bought a MK171 kit because I had the idea of replacing the mic and speaker with 1/4’’ jacks, toss it in a project box and use it as a guitar effects pedal.
My questions are:
-What would I have to replace / remove to have this kit operate at instrument level?
-How would I replace the existing switches with switches I can mount on the outside of the project box?
-Could I add potentiometers to blend the 3 different effects with each other and the dry guitar signal?
-Can I replace the battery with a DC power jack OR add one in addition to the battery clip?
I’m relatively new (and self taught) at electronics, so every bit of help I can get is fantastic!
Thank you,
-Jack 
We have no experience with this, but hereby a couple of remarks and hints.
- No idea what output level one can expect from a guitar pickup, I would expect a couple of mV. I know that guitar pickups need to see a correct impedance, or their sound changes.
- You will have to remove R6 which supplies power to the mic. The guitar pickup does not need power.
- Just remove the buttons and solder short wires to the external buttons. Keep them as short as possible to avoid hum/noise pickup.
- Adding potmeters is not possible.
- Yes, you can replace the bat. clip with a DC jack. Watch the polarity and make sure to use a 9V regulated DC adaptor.
Thank you!
One more question. Are the switches latching / could I use latching switches?
Push buttons are latching.
