Dynamics and articulations are affecting multiple staffs of the same instrument
The basic problem is that when playing music back, the dynamics and articulations are affecting other parts of the same instrument.
1) Use multiple staffs of the same instrument
2) Write music in each staff (can be as simple as a held note)
3) Put an articulation of dynamic change (including a crescendo or decrescendo) on the music in one staff, where there is also music in another staff
4) Playback the section