Mute/unmute doesn't seem to be working properly on the drums.
For example I press DRUM+MUTE then a pad to mute a part. The part is muted. Ok so far. I release all buttons. I want to mute a further pad, so I press DRUM+MUTE again and the pad I want to mute ..... this unmutes all parts.
Or, I press DRUM+MUTE and multiple pads to mute them. They mute fine. I release the buttons. Now I want to go in and unmute ONE of the muted parts. I press DRUM+MUTE and the part I want to unmute .... this also unmutes all parts.
As far as I can tell from the manual, this isn't expected behaviour.
What's going wrong?