baffled by 1/4"jack pins on schematic

Hi, Im a little baffled on which pin is which for the i/o jacks on this schematic
https://www.electro-tech-online.com/custompdfs/2006/11/p90ramp-1.pdf
If anybody could shed some light i would be most thankfull.
Is the centre pin of the input jack the tip? Whats the other pin going to the battery? Are they ment to be stereo jack, if so which pin are L and R?
CONFUSED!?!?!

Heres what I think:

The input is shown as a stereo jack. The middle connection connects to the batteries - . The shield connects to circuit ground. The tip to signal input. By doing this, the circuit only powers up when a mono jack is inserted into the input as this completes the ground connection.

The output jack is a normal mono jack. It connects to a SPDT switch which allows either bypass or effect.

Ahh, yes! I see that know! I couldnt work out how the output jack was supposed to be wired. Going to a switch, ahh, yes, ofcourse! DOH!
Thankyou very much for solving that one for me!
Back to the bench!