ReTune allows you to change audio attributes at marks. Create marks where you want to make changes and you can adjust audio values including tempo, pitch, gain, pan OR add a pause at each mark. Drop the pitch by one semitone at Mark 1 and increase the tempo to 1.2X at Mark 2. This works on both iOS and Mac versions.
Here is how on iPad (other devices are similar)
Create a mark at the position where the pause is desired
View the Marks List, Tap Songs, Select Marks
Enable Retune – you will see a Orange bar across the screen.
Tap the Info Button (i) the Mark
See the ReTune settings for that mark.
Adjust the Delay Time. This will insert a pause in the music.