I realise this doesn't answer your question but it might be an alternative, or suitable for others.
I've recently bought a Nux Mighty Plug and it is now my go to practice tool as it's just so convenient.
Plug it into my bass, short headphone lead plugged into it and I'm completely untethered. You can bluetooth your music source to it and there's an app to set up presets containing amp, cab and effects sims. USB rechargeable and lasts a good amount of time.
As I said, not the answer to your question but possibly a cheap alternative.
This it, bass, Nux, headphones. Can't wait for summer garden noodling. ๐๐