The FULL OUT of the MOTM-510 is *always* a positive voltage. If fact, if you look at the wave with a scope you can see this, and also it will clip at ground. The AUDIO OUT is AC coupled, so you will get +-swings. I should have put this in the manual, I will add it. Paul S.
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MOTM-510 clarification
2004-10-10 by Paul Schreiber