Spark Control
I've had a Spark 40 since pre-order days and Spark Control pedal (not control X). I found out long ago that the Spark app (which I rarely use), must be running and onscreen (on Android) for the pedal to work. Was disappoint.
I rarely use the Spark app, so I never used the pedal. Have recently updated my Spark 40, and have the same issue, so that was never sorted out apparently.
Am considering a Spark Edge and was wondering which pedal could use it where I don't need the Spark app to be onscreen.
In other news, I finally retrofitted a headphone jack that doesn't cut out the speakers (via TP48 and TP49 and ground) to my Spark 40 today. Only took several years.