hi sheikh make sure that you give midi channel to each track individually and respectively. that has to be one of the most important reason if not solved, then it means that there have to be some midi information in event view which cause this changing. select all of tracks open the event view go to edit menu and choose select by filters from the select menu in the open click on all and then remove the tick from note. go to edit menu and choose delete I also advise you to subscribe in j sonar forum which there are much more handy people around. good luck ----- Original Message ----- From: ziad To: amt@xxxxxxxxxxxxx Sent: Tuesday, October 16, 2007 12:39 AM Subject: [amt] please help hi guies, i am new to the computer music business and i hope someone could help me with my problem. i am using sonar 6 and i am working on a project. i have recorded the guitar, base, accordion and trumpet. during recording, i can hear the accordion and the trumpet but in playback, i hear a piano sound on both tracks but the base and guitar are heard ok. can anyone help solve this problem with many thanks in advance. ziad