The 2N2222's are NPNs and they will turn on and pull the signal to ground when 30V is applied to their respective base resistors.
The inputs do have built-in pull-up resistors so you can leave unused inputs open.
You show no filter caps on the 7805 input and output, and at the chip power input, which you need. (Look at the 7805 data sheet).
Are you aware that the chip can only pass audio signals between Vdd and Vss? Thus since Vss goes to ground, the audio signal can't go below ground. So you have to bias the audio signal DC (average) level at 1/2 Vdd. This can be done as shown in the "Typical Application Circuit (Single Supply) as show on page 15 of the data sheet. (You only need one of the bottom op amps for all the circuits but you need one of the top op amps for each output.) The op amps need to be low-noise audio "rail-to-rail" input and output types. A Digikey search gave a couple page listing of such op amps.
Alternately you could use the bottom circuit on page which uses +2.5V for Vcc and -2.5V for Vss (The max total supply voltage, Vcc-Vss, across the chip is 6V). It's a more simple circuit but the disadvantage, of course, is that it requires a negative as well as a positive supply voltage.
Edit: Depending upon the impedance of the load the MAX output sees and the distance from the MAX output to the next stage, you probably need a buffer amp on the outputs, as shown.