First, let me say I've done some reading and research, but I didn't study in this field, so my terminology and knowledge may/will be limited and/or flawed, so please correct me at any point if you see a mistake
I've decided to venture in to the world of modifications on some drum machines I own and have several beginner questions. See the links for the schematics for a Boss DR-110:
http://manuals.fdiskc.com/tree/Boss/Boss%20DR-110%20Service%20Manual.pdf
as well as a decent picture of the board :
https://www.flickr.com/photos/8841838@N07/3335229549
Here you can find How to Read Resistor Color Code: http://www.apogeeweb.net/
I've found a list of potential mods for this board and the one I've selected first says "replace R12 with a 1k pot" ... this is in an isolated area of the board and seems to be as basic as it gets for mods.
The person has documented this as a 1k pot, which I'm not sure is correct since I haven't opened up my unit yet to view the color coding on the resistor and can't see in enough detail from the link, but let's assume its correct. My mod should involve the following:
remove power
Unsolder resistor, remove resisitor
calculate resistor value, test resistor (not required, but I need practice)
wire pot (ground first and attach, input, output)
attach input/output
test
My questions are:
1) How do I determine the resistance and power value of the removed resistor with and without a multimeter? The power supply for the unit is 9 volts.
2) How do I calculate what size wire I should use for the pot and input/outputs?