Serial.begin() should be called only once, in setup().
Please fix the misplaced curly braces, and use Format (CTRL+T) to get properly indented blocks.
Your code will behave unexpectedly when multiple sensors are touched at the same time. It could be simplified into something like
freq = 0;
if (total1 > range) freq = 523.25;
else if (total2 > range) ...
...
if (freq > 0) tone(SND_PIN, freq);
else noTone(SND_PIN);