Some knocks are present only at a "float" condition, neither pulling or coasting like right before a shift to the next higher gear happens. If that describes your noise, it's like being a little bit pregnant- - - - - -things ain't going to get any better! A rod knock can be a light "double-tap" noise at a steady RPM and no load. Worn or loose main bearings make a slower, deeper "thump" noise mostly while accelerating which goes away as the load on the engine decreases.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!