I have a schematic which is provided between the images. I was searching Google with no luck finding what does +Vs and -Vs mean. Also, on the schematic is a weird μP square. Even the guy in my local electronics couldn't identify it. Could someone explain these things for me?
+Vs is the connection for the positive voltage supply. -Vs is the connection for the negative voltage supply. "μP" is very, very commonly short for "microprocessor".
\$V_S = \pm20V\$
\$V_S\$ DC Supply Voltage ±25 V
\$V_S\$ Supply Range ±5V (Min) to ±25V (Max)
And other places for split supply operation. Can also be used in single supply.
\$\mu P\$ = micro P = microProcessor. Sound and mute/stand-by control have to come from somewhere.