I have mid drive Twist Throttle Raleigh eMTB and the hub drive Thumb Throttle Ebike in my Avatar.
They both work the same Little twist/Little push go slow. Big Twist/Full Push go fast and slow/faster speed in between.
That JBL speaker is cool but too expensive to ship to Ontario CA.
I bought this speaker at closeout electronics store and it's good.
I rigged up a handle bar mount to the speaker with spare bike light bar mount clamps.