It would be a big help if the tempo could be increased each time the tune is repeated. Users would enter the number of beats per minute (BPM) increase in a box near the tempo. When a new chorus begins, the tempo would increase by the designed BPMs. If tempo does not change, that block would contain a zero (default).

So a person could work on a new tune by starting at slower speed, and each time the chorus is repeated, the tune would be a little faster.

At the present time, I have to create a "wav" file, then use different software (Amazing Slow Downer) to repeat the tune and change the tempo each time the tune is repeated.