As an alternative to using the sliders, and to make precisely editing pitch, tempo and effects easier, you can turn on plus and minus buttons in the editor. When the buttons are enabled, the values increment and decrease with the tap of the buttons. Here are the steps to turn on Music Speed Changer iOS buttons in settings.
Tap the Gear to Open Settings
Settings can be accessed from the "Listen Now" tab as well as from the editor.
Click the gear icon at the top.
Enable Plus/Minus Buttons
Tap the toggle button to turn on plus and minus buttons.
Enabled plus and minus buttons in the editor