Since posting the OP I've discovered absolute Bluetooth
heaven with my S9 phone. (Thank goodness for
www.Head-Fi.org members.)
I'm using a Fiio BTR5 in LDAC, with Shure SE425 IEMs using Shure triple-flange tips (tried
everything else) and the Shure cable with in-line controls.
Not extreme audiophile level of purity, but for the money and my level of need, and the limits of the phone for that matter, I couldn't possibly be happier.
I practice tai chi and other arts a lot while listening to music. I also play a series of tracks for "breathing" in a meditation practice that have a tic toc sound that spread the duration of a breath longer and longer. And I listen to audiobooks with an app called "Smart" Audiobooks player.
When practicing tai chi etc, I keep the BTR5 clipped to the back of my belt (or "waist pack" belt) with the phone on a holster on my right side.
This enables me to have all the benefits of Bluetooth since I can grab the phone and use it without the headache of a cable attached, especially when re-holstering.
Sound quality with music with the BTR5 and Shure IEMs and triple-flange is
amazing! At least it is to my ears, anyway.
And the controls on both the BTR5 and inline on the cable give me everything I could ever want! Vol up/down, play/pause, and next/previous track!
Next/previous track goes a long way indeed! It's not just useful for music!
With the breathing tracks, I can sit meditating or even lying in bed (with normal headphones in that case) and have the BTR5 in my hand, and with eyes closed and no movement other than a simple press of the thumbnail I can go to the next longer or next shorter "breath" length based on my current breathing. And if lying in bed falling asleep, the last thing I do is press to pause and then to power the BTR5 off, and that's it. Off to dreamland.
And with an audio book, I can press the BTR5 or inline control and go back 10 second to replay what I just missed, or of course press repeatedly to go back further.
And did I mention that with music the sound quality is
amazing?
Heaven!