<<..the reason for using a sus chord is to test the compatibility of the 4th and 5th(D4-G4 and D4-A4) as they are played together. If one is beating slightly faster than the other, it will show up clearly when played in a sus4 type of chord and you can make a correction based on this test...yes, there is going to be some movement in the 4th and the 5th when tuning in ET, and this sus4 test is suppose to cancel those beats..supposedly, and this is from the person who showed me this(rip), Russian technicians have been using this type of 'test' for a long time. When you do this type of test, all the sus4's should be smooooth.>> Jim Harvey did a class on various tips and tricks at a National several years ago, and recommended including this chord in one's mental bag of tuning checks. --David Nereson, RPT
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