The TL072 rails are backwards, right? (unless you’re using red for −12 V in case your color coding is backwards, and your caps too 
).
EDIT: Also, a single 100k pullup for two separate jacks?
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The TL072 rails are backwards, right? (unless you’re using red for −12 V in case your color coding is backwards, and your caps too ).
EDIT: Also, a single 100k pullup for two separate jacks?