A great site to hear the different types of radio sounds you aren't familiar with would be the
W2SJW - Home site, which will help you identify some of the different "weird" sounds you hear out there.
Regarding the two tones used on the NJ UTac 6 channel, I've been hearing for the past year the 192.8 tone for large event coordination up North, and down in the Monmouth County area, the 203.5 tone used. Must be set up for inter-op purposes and for a reduction of interference issues as well.