More info at https://en.wiktionary.org/wiki/spiel . Pronounced as you (gp) spelled it phonetically because it's borrowed from German.

It's taken from Yiddish, which took it from German.

From Yiddish? I didn't know that. Interesting and Thank You.

A few years ago, I used the word "Schmuck", and someone asked me if I was Jewish (I'm not). I didn't realize that "Schmuck" was also a Yiddish word until then. I looked it up, and I didn't realize that some Yiddish speaking people consider it to be obscene profanity! So now I use a little more sparingly.

https://en.wikipedia.org/wiki/Schmuck_(pejorative)

Personally I prefer 'schpiel' :)

Thank you.