So the monoprice 1 ft cable did consistently provide less lag. 5 ms less lag. Yippee. The cable is just 12 inches (as opposed to the 18" cable from Amazon) and is quite thick with a braided shell. It doesn't bend very well and was hard to use. I'm going to test with it connected to a powered splitter and switch on the 12' run
The other thing I received from monoprice was their $100 2D-3D convertor.
). So I ran Rock Band 3's auot calibration through the 3D convertor... and suddenly I was getting 99 ms. That's 9 ms faster than without the convertor. This really suprised me, so I kept testing with it. I consistently got 98-99 ms with the convertor in the loop. The convertor creates a SBS video stream and the 3010 auto-detects that and goes into 3D mode. However, you can manually go back to viewing the L+R images side-by-side. I ran the calibration in this mode, expecting it to still be around 99 ms, but it returned to 108 ms.
So one of two things is happening: The 3010 has about 9 ms less lag in 3D mode. Or the alternating left and right images have an odd effect on the auto-calibrating guitar and cause it to read about 9 ms less lag.
I played a bit of RB3 through the convertor and the 99 ms time. It seemed "on" enough to me, but I'm not sure I'd notice 10 ms.
I'll hook up my laptop and run inputlag.exe which should give better results.
One final note: When I had the 3010 before, I only used RB3 but I thought I should compare RB2. I remembered to do it this time, and it does seem there's a big delta between the two games. The 108 ms I consistently get on RB3 showed up as 89 on RB2. And in 3D mode, I got 80 ms on RB2. For what that's worth.