7 8 4 6 12 11 10 9 5 3 1 2 Input: (see #9 on above diagrams) Connect a cable (shielded with ¼” mono plugs) coming from your guitar, bass, or other instrument into this jack. Always use good quality shielded cables (eg. Fulltone Gold Standards) for audio signals, speaker cables are un-shielded and should not ever be used to connect your instrument. A-Out: (#12) Connect a cable (shielded with ¼” mono plugs) going to your amplifier. A-Out does not have a transformer on it.