Phones/rec out socket. It is implied in the user manual but can anyone
verify from experience, more exact details.
1/4 inch socket with 2 isolated switch actions (Jalco). For phones, ie
stereo plug, the speaker is fully muted, via control logic , not carrying
speaker
current.
For rec out , mono plug (explicitly stated in the user manual), then speaker
is attenuated, by a fixed amount ?, but not muted like the stereo plug
situation.