Recording will be monophonic if Mono is selected in the Recording Type setting of the MODE switch.
When recording in mono, input the audio signal into the MONO/L input jack.
During mono recording, and while waiting to record, the audio signal will only be sent to the MONO/L output jack, as well as only to the left channel of the headphones. No signal will be sent to the MONO/L output jack or the right channel of the headphones.
A phrase recorded in mono will be played back from both MONO/L and R output jacks, as well as both left and right headphone channels.