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Also known as Iambic Paddles, or Iambic Key.You can tell the basic differencebetween the modes with the letter C. In mode A you could squeeze both paddles(dah before dit) and you would let go of both after hearing the last dit. Withmode B, you start the same BUT let go of both paddles after hearing the second*dah*.==Slap Keying==Single lever keying is sometimes called slap keying since you can only depress either the dit (slap to the right) or dah (slap to the left). If you use a dual lever keyer such as an Iambic keyer only slapping to the left or right, then you are slap keying. This is fine, however, it does not utilize the "iambic" functionality of the key.