I create a new instrument track 1 and include a Presence instrument for example Piano.
I create a new instrument track 2. The Piano sound is included automatically to this track 2. And if I want to change this Piano by other instrument on track 2, the instrument in track 1 is changed in the same time. Same behaviour if I change the volume of one track (1 or 2) the volume of the other track is changed in the same time. Are tracks linked at creation ? I don't understand this behaviour.
How to create independants instruments tracks allowing me to change anything without to modify others traks in the same time?