Reviews seem to indicate they are mono. So I would run a regular 1/4" cable from left of keyboard to line one and right of keyboard to line two, and record them both, panned hard right and left.

Otherwise you could run a single cable from your keyboard left side output to line 1. Using just the left jack will put most synths in Mono mode.

Or get a regular 'Y' adapter and combine L&R to one line input.


I do not work here, but the benefits are still awesome
Make your sound your own!