I asked Doug and this was his response
"Sorry there is no simple reset and until this moment it never occured to me.
For the audio, I run audio through A1. I select all and use a scope to adjust them all at the same time until A1 is doubling the audio amplitude. Then I press and hold the encoder to save them all at the same time.
For the CV, each node is done individually. I run a CV to the pitch inputs of two tuned oscillators. For one of them, I have the CSR in the path. I adjust the node level until the pitches match. I then press and hold the encoder to save the node value."
Seems simple enough!