FL Studio Mobile
Use leveller to monitor levels and to make precise changes to volume level and panning. NOTE: If you are using this on the Master, make sure to put an instance at the end of the FX chain to monitor final output levels. Do not let the levels exceed 0 dB, otherwise your song may sound distorted or 'crackly' depending on how severe it is. This is called 'clipping'. Read more about it here.
To load presets tap the menu icon (upper right) and choose Presets List.
There are two controls, the Level slider and Pan knob.