Omar! There's no harm in letting the old definition file in Sonar. Simply reassign your new instrument definition file usingSonar's "options". Instrument in the usual way. You'll be good to go. Jean Visitez mon site / Visit my site at http://www.studiomontebello.com ----- Original Message ----- From: Omar Binno To: ddots-l@xxxxxxxxxxxxx Sent: Wednesday, January 07, 2009 9:30 AM Subject: [ddots-l] removing instrument definition files Hello, I posted this question a couple days ago and haven't heard a response. How do I completely delete an instrument definition file out of sonar? I have an updated version to the file, and I'd rather delete the old one before importing the new one in there. Thanks. Omar Binno AIM: LOD1116 Skype: obinno1 Website: www.omarbinno.com