My mixer only supports a single channel feed to the M-One / M-One XL which only has a stereo input. So I purchased an adaptor cable to mate the two. But on the input levels on the front of the M-One / M-One XL, only one channel (left) is showing (bouncing) any signal. Is this normal? Am I missing anything by only having the left channel as the input source.
This is perfectly normal. When you only plug the left channel input, the signal will be distributed automatically to both engines.