Turned knob and got a buzz. turned knob again and no sound. Just finished a load and was starting on the next.

Yes, it does.

PUSH TO START/END OF CYCLE SIGNAL The End of Cycle Signal produces an audible sound when the drying cycle is finished. Promptly removing clothes at the end of the cycle reduces wrinkling. Turn the END OF CYCLE SIGNAL knob to select the desired setting (On or Off). Press the PUSH TO START knob to start the dryer.

Page 5 of the User Manual
https://www.amana.com/content/dam/global/documents/202003/specification-sheet-ned4655especsheetv01.pdf

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A fairly common problem! The official instructions are

Before using your dryer, wipe the dryer drum with a damp cloth to
remove dust from storing and shipping.
1. Load clothes loosely into the dryer and close the door. Do not
pack the dryer. Allow space for clothes to tumble freely.
2. Turn the Cycle Control knob to the recommended cycle for the type of load being dried. Use the Energy Preferred Automatic Setting (,) to dry most heavyweight and medium weight loads. See "Drying, Cycle, and Temperature Tips."
3. Select a temperature setting on models with a Temp/Fabric selector. The cycle descriptions include temperature setting suggestions.
4. Push the START button.

Stopping and Restarting
You can stop your dryer any time during a cycle.
To stop your dryer
Open the dryer door or turn the Cycle Control knob to OFE
NOTE: The Cycle Control knob should point to an Off area when
the dryer is not in use.
To restart your dryer
1. Close the door.
2. Select a new cycle and temperature (if desired).
3. Press START

Extracted from
http://www.manualslib.com/manual/511763/Whirlpool-Lte5243dq.html?page=10#manual

Is the belt tight around drum. If yes, then there is a tripable thermistor in the heat tube. Small button on it that slight push on it resets device. If belt is loose but not broken, then it is off the tensioner b

Is it the same buzz that goes off when the load is finished? The knob may be broken, if so what you need to do is pull it off and see if the handle knob is really turning the smaller knob, if it isn't, replace the knob.
If the knob is fine then you have a problem with your controls and you need someone with electrical experience to look at it.

Is it the same buzz that goes off when the load is finished? The knob may be broken, if so what you need to do is pull it off and see if the handle knob is really turning the smaller knob, if not, replace the knob.
If the knob is fine then you have a problem with your controls and you need someone with electrical experience to look at it.

electric dryerwon't stop buzzing

check the door swich to be sure made up properly

This may be a thermal overload switch which is probably located underneath the top of the dryer. When you find it, bypass it to see if that is the problem. If so, replace it for about 10-12 dollars. Check the breakers first, then the connections in the back to see if they are secure.

Need model # for exact part look up sound like start cap for motor or bad motor