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What kind of headphones, if any, do you use. I started off with earbuds and an old Sony headset but since I was introduced to the letter "I" I only hear and dot with an echo. And now the letter"S" sounds like a dot with an echo. The same for "U". Any recommendations?

What is the rest of the setup? Phone, tablet, laptop? Some tech has audio signal processing to 'enhance' eg music, speech etc. This may be treating CW tones as unwanted noise.

Just a thought.

Certainly Zoom is said to suppress audio CW tones unless you go into settings and choose something like 'raw'. Thinks it's background noise otherwise.

Edit. To answer the question: cheap petrol station wired earbuds on Samsung phone, and when allowed, wife's high end studio headphones on equally high end windows laptop.

No probs.

With the laptop, I had an awful sound with morse code, until I closed the surround sound "somewhere" in the audio settings of the sound card menu. (Realtek) Search your audio menu! A better headphone will only help you with a wide sound capability of a receiver.

I am using a old Lenovo laptop Win10 with wireless Bluetooth earbuds by Jbl and Jib. The wired headphones are by Sony the $10.00 variety from WM. So nothing special here. As far as I can tell there is no special filtering or processing on the audio from the laptop. It gets so bad sometimes that I have to remove the earbuds/headset and listen to the speaker from the laptop. BTW I am running the speed at 30/10 so could that have a impact on what I am hearing? Suggestions?

Try different browsers maybe?

Try a different audio frequency also.

Earbuds don't work well with CW. The sound is too choppy. Bluetooth is not very performant either. There are micro delays. I suggest closed-back wired headphones, the older the better. There are Chinese replicas of the epic Japanese ham headphones of the 70s on Ebay, but I haven't tried them. You would probably have to change the jack as they are jumbo jack and mono or use an adaptor. I once found a proper vintage pair of cans for amateur radio use at a charity shop but they smelled like rotten eggs. Euww.

I will give the suggestions a try. Thanks for the help!!

I personally use ear buds all the time and enjoy them while practicing. I also use earbuds attached to my HF radios while sending CW during a QSO and think they work great. I use a pair of Apple wired earbuds, Panasanic, inexpensive, set I bought of amazon also work very well.

I struggled to find decent headphones as too many seemed to be geared towards phones or tablets and were too expensive to justify very little.
I took a punt on a pair of very simple bhi wired headphones and they're working a treat.
Got mine in the UK at £20.00 in USA they're retailing for $33.00 at DX Eng.

https://www.dxengineering.com/parts/bhd-hp-1