Congruent (identical) notes are marked red in the tracks tab. Congruent notes result in higher note volume, if the effect is unwanted just delete the top note.
If you misplaced a note while recording, don't even hit the stop button but instead tap the undo button , tap undo and restart recording.
Every recording requires its own set of quantization parameters. Better results are obtained if you don't just stick with quantizing everything with 1/16. Try different settings and hit the undo button in between.
If a recorded melody should flow but it sounds more like staccato, the notes are simply too short. The perfect correction would be to manually increase the note lengths in the piano roll editor, but there is a quicker way: increase the track's release time until it sounds like legato.
Reverb requires a lot of CPU power. If stuttering occurs during playback, decrease the reverb quality. Set it to high quality before you export your final song to wav.
Some Android devices exhibit high latency, that is a delay between playing the keyboard or drumpads. This can interfere with the ability to play in time with existing tracks. In this case slowing down the BPM significantly can significantly alleviate the problem.