HRM pedal mod?

[Structo]

I found this when looking at a HRM schematic today.

Is this commonly used?

Looks as if when you flip the link switch that the PAB will come on with the OD.
Is that true?

Maybe a neat thing for the guys with the HRM mod.

[dcribbs1412]

Thanks Tom
will be trying this

[David Root]

OD with PAB is great in my Bloozman! (Bluesmaster HRM). Thick Oozy-bloozy tone.

I have PAB and MB in my #124 pedal. OD with PAB and MB all on is awesome!