You can practice receiving Japanese sentences using a random generator.
You can also freely select the playback speed and tone.
There is also an adjustment function (5 levels) for the space ratio between generated codes.
The Pro version has a function that superimposes noise to reproduce an environment close to actual communication, and a function that generates echo (reverberation) to simulate a Morse exam hall.
For chord listening, you can select repeat from endless, 10 minutes, 20 minutes, 30 minutes, 60 minutes, or 120 minutes.
When listening to code, it is possible to remove ",-=@".
Added a function to train examples of communication in Western languages ​​(Ver1.4.0)

※Limitations
Please note that this does not work properly with Bluetooth headsets, but this is due to the specifications of the app.