The interface is not adjustable. That is a negative. Why some developers assume that every person on the planet has their exact monitor and desktop setup is beyond me. This shows a lack of consideration to those whose eye sight is not what they used

The humming guide does not work. It may be a settings issue but there is no apparent way to set the microphone input and test for audio. I did get the registration key, it was in the browser window rather than being sent to me in an email. At this point: The inability to adjust the size of the interface to meet my desktop specs, the inability to set and test the audio input for the microphone; I give this program two thumbs down. If I cannot recommend this free version, I will not recommend the paid version. The free version is a tool to show case ones talent and the worthiness of a purchase. This program failed to do so in two of the most important points every program must fulfill. 1- Ease of adapting to multiple desktop scenarios. 2- Ease of setup. If the user cannot do a simple device setup to insure that there is an audio input which is necessary for the humming recording, then the program has failed an important part of user accessibility and customer care. Microsoft had a similar program about 5 years back that, while no more advanced than this one, worked as expected. Again, I give this program a two thumbs down.