Handy little utility. This $15 app plus the cost of a headphone connector saves me having to shell out $50 for a hardware toner with fewer features and which I would only use occasionally.
Works just fine for generating test tones, and there are lots of options to play with. I don't know what the limitations of the unregistered version are.
This version requires an update to your registration code. I do not know if any cost is required...yet. If you do not have an older version backup, do not install until you have the upgrade code.
Please add tone bursts and 1/3-octave warble tones, very common for loudspeaker and listening room tests. You can see this site for a discussion of tone burst: Linkwitz - Toneburst Test Signals.