So I have an Line6 AX2 that I luv, but I got a looper for Xmas, and it's the one effect that the AX2 is missing...

Now if I place the looper between the guitar and AX2, the guitar is recorded 'clean' so that any effects that I set are applied to all loops as well as the live soloing. Not nice.

So I searched Google for 'line6 ax2 schematic'  - and to my surprise, I got a hit at: http://elektrotanya.com/line_6_ax2.pdf/download.html

I downloaded the schematics, and wow - this is the easiest modification to make! I didn't even have to cut any traces - Line6 ran a multiwire jumper from the main board to the master volume pot break-out board that I can hack!

So the 'splice out' to a send/receive pair of 1/4" jacks can be made right on the cable that links up to the master volume pot.

Since the AX2 is in stereo (and my looper isn't) - I only spliced in to the Left channel - but with stereo jacks, you could splice both wire 1 and wire 4 just as easily.

I also used a 1/4" jack with a switched contact on the receive jack (it switches as you push in the plug) - so that the receive defaults to getting the 'shorted' send signal - if you don't plug anything in the the loop.

This way the amp runs normally with no loop cords plugged in.

But plug a cord into the (upper) new send jack on the back panel to connect to the looper input, and another cord from the looper output to the (lower) new receive jack on the back panel, and its magic!

Uh, here's a few pics:

If you need more info (if anyone on the planet is still using this paradigm-breaking amp, and wants to mod it), just ask - I'm an EE :-)

BTW, it works great! I can record a loop with rhythm guitar effects on, and then play the loop back to the power amp while I solo (in stereo) with lead guitar effects!