How do I use deck 2?

In 1971, the Advent Corporation combined Dolby B-type tape-hiss-noise reduction system with chromium dioxide tape to create the Advent Model 201, the first high-fidelity cassette deck. Dolby B raises treble levels well above the noise level, and reduces them on playback, while CrO2 used different bias and equalization settings to do much the same, and extended frequency response into high fidelity range beyond 15 KHz for the first time. This deck was based on a top loading mechanism by Wollensak, a division of 3M which was commonly used in audio / visual applications. It featured an unusual single VU meter which could be switched between or for both channels, and lever operated controls, similar to those used on reel-to-reel mechanisms.