The TS-590S has a CW-T button that will automatically tune the incoming signal to the tone frequency you have selected. Just push the button and done. Another way is the display I get on a spectrum where I can move the tuning up or down to get very close to exactly on. There are times when the TS-590S goes off in a tangent. Mostly though it works even on weak signals in the noise.
Don't really know how TenTec does theirs. Might be better.
Have fun and go to the nearest Amateur Radio shop and try it out.