Manhattan College of Music professor and Skilled double bass participant Timothy Cobb teaching a bass lesson from the late 2000s. His bass has a minimal C extension with a metal "equipment" with buttons for enjoying the pitches over the extension. Mp3 juice obtain See the record, and after you find https://lexsrv3.nlm.nih.gov/fdse/search/search.pl?match=0&realm=all&terms=https://mp3juices.la