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Line6 POD HD Desktop which I'm very happy about, but I'd like to be able to use a pedal too. For instance for the looper (great but useless if you need to start/stop it with your fingers), maybe switch between settings for intro/rythm/solo ... well all those things you do with a pedal!
Being curious and careful with my money (sometimes) I dug into the idea of making one myself instead of buying Line6 cheapest compatible one, a FBV EXPRESS™ MkII (80%20 USD on amazon). Apparently it was a not so hard task with former models (see the links here under) but with my POD HD Desktop, unfortunately things got complicated. Line6 took a even more all-digital turn, even for the pedals. This page is the place where I'll store my remarks, I hope it can help you.
Readouts are simple analysis done with a multimeter, nothing fancy. Then I put all the lines in my DSO oscilloscope to identify those who just seem to be fixed voltage but aren't. Bingo, at least pins 7 and 8 are in that group. The strange 9v-ish pins are still mystery, but maybe they are just really 9v.
Of course don't short GND and the 9v pins, your POD will restart (you're shorting power, kinda bad thing to do). We can assume that it's protected but let's just not do it willingly.
LAP-C Zeroplus Logic cube 16064 to have some more info.
Quick analysis based on this diagram (situation : nothing plugged on the POD) :
So what could it be?
We get if we remove what looks like a preamble 3 bytes remaining : 0x0A 0x02 0x00
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